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78231 = 389293
BaseRepresentation
bin10011000110010111
310222022110
4103012113
510000411
61402103
7444036
oct230627
9128273
1078231
115385a
1239333
13297ba
142071d
15182a6
hex13197

78231 has 8 divisors (see below), whose sum is σ = 105840. Its totient is φ = 51392.

The previous prime is 78229. The next prime is 78233. The reversal of 78231 is 13287.

Subtracting from 78231 its sum of digits (21), we obtain a triangular number (78210 = T395).

It can be divided in two parts, 782 and 31, that multiplied together give a palindrome (24242).

It is an interprime number because it is at equal distance from previous prime (78229) and next prime (78233).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78231 - 21 = 78229 is a prime.

It is a super-2 number, since 2×782312 = 12240178722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78198 and 78207.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 78231.

It is not an unprimeable number, because it can be changed into a prime (78233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121 + ... + 413.

It is an arithmetic number, because the mean of its divisors is an integer number (13230).

278231 is an apocalyptic number.

78231 is a deficient number, since it is larger than the sum of its proper divisors (27609).

78231 is a wasteful number, since it uses less digits than its factorization.

78231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

The product of its digits is 336, while the sum is 21.

The square root of 78231 is about 279.6980514769. The cubic root of 78231 is about 42.7687240574.

The spelling of 78231 in words is "seventy-eight thousand, two hundred thirty-one".

Divisors: 1 3 89 267 293 879 26077 78231