79940 has 24 divisors (see below), whose sum is σ = 192192. Its totient is φ = 27360.

The previous prime is 79939. The next prime is 79943. The reversal of 79940 is 4997.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (79943) 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, 146 + ... + 425.

It is an arithmetic number, because the mean of its divisors is an integer number (8008).

2⁷⁹⁹⁴⁰ is an apocalyptic number.

79940 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

79940 is an abundant number, since it is smaller than the sum of its proper divisors (112252).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96096).

79940 is a wasteful number, since it uses less digits than its factorization.

79940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 79940 is about 282.7366265626. The cubic root of 79940 is about 43.0779189330.

The spelling of 79940 in words is "seventy-nine thousand, nine hundred forty".