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390631 = 3112601
BaseRepresentation
bin1011111010111100111
3201211211211
41133113213
5100000011
612212251
73214603
oct1372747
9654754
10390631
1124753a
1216a087
13108a57
14a2503
157ab21
hex5f5e7

390631 has 4 divisors (see below), whose sum is σ = 403264. Its totient is φ = 378000.

The previous prime is 390581. The next prime is 390647. The reversal of 390631 is 136093.

390631 = T143 + T144 + ... + T173.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 390631 - 27 = 390503 is a prime.

It is a super-2 number, since 2×3906312 = 305185156322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6270 + ... + 6331.

It is an arithmetic number, because the mean of its divisors is an integer number (100816).

2390631 is an apocalyptic number.

390631 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

390631 is a deficient number, since it is larger than the sum of its proper divisors (12633).

390631 is a wasteful number, since it uses less digits than its factorization.

390631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12632.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 390631 is about 625.0047999816. The cubic root of 390631 is about 73.1008177277.

The spelling of 390631 in words is "three hundred ninety thousand, six hundred thirty-one".

Divisors: 1 31 12601 390631