79429940 has 24 divisors (see below), whose sum is σ = 166992840. Its totient is φ = 31735808.

The previous prime is 79429897. The next prime is 79429951. The reversal of 79429940 is 4992497.

It can be written as a sum of positive squares in 4 ways, for example, as 5779216 + 73650724 = 2404^2 + 8582^2 .

It is a junction number, because it is equal to n+sod(n) for n = 79429891 and 79429900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22196 + ... + 25524.

It is an arithmetic number, because the mean of its divisors is an integer number (6958035).

Almost surely, 2^79429940 is an apocalyptic number.

It is an amenable number.

79429940 is an abundant number, since it is smaller than the sum of its proper divisors (87562900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79429940 is a wasteful number, since it uses less digits than its factorization.

79429940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4531 (or 4529 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 79429940 is about 8912.3476144055. The cubic root of 79429940 is about 429.8610331539.

The spelling of 79429940 in words is "seventy-nine million, four hundred twenty-nine thousand, nine hundred forty".