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79990 = 2519421
BaseRepresentation
bin10011100001110110
311001201121
4103201312
510024430
61414154
7452131
oct234166
9131647
1079990
1155109
123a35a
132a541
1421218
1518a7a
hex13876

79990 has 16 divisors (see below), whose sum is σ = 151920. Its totient is φ = 30240.

The previous prime is 79987. The next prime is 79997. The reversal of 79990 is 9997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79997) 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, 21 + ... + 400.

It is an arithmetic number, because the mean of its divisors is an integer number (9495).

279990 is an apocalyptic number.

79990 is a deficient number, since it is larger than the sum of its proper divisors (71930).

79990 is a wasteful number, since it uses less digits than its factorization.

79990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447.

The product of its (nonzero) digits is 5103, while the sum is 34.

The square root of 79990 is about 282.8250342526. The cubic root of 79990 is about 43.0868983636.

It can be divided in two parts, 79 and 990, that multiplied together give a triangular number (78210 = T395).

The spelling of 79990 in words is "seventy-nine thousand, nine hundred ninety".

Divisors: 1 2 5 10 19 38 95 190 421 842 2105 4210 7999 15998 39995 79990