40399980 has 48 divisors (see below), whose sum is σ = 113460480. Its totient is φ = 10740928.

The previous prime is 40399979. The next prime is 40399981. The reversal of 40399980 is 8999304.

It is an interprime number because it is at equal distance from previous prime (40399979) and next prime (40399981).

It is not an unprimeable number, because it can be changed into a prime (40399981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24337 + ... + 25943.

It is an arithmetic number, because the mean of its divisors is an integer number (2363760).

Almost surely, 2^40399980 is an apocalyptic number.

It is an amenable number.

40399980 is an abundant number, since it is smaller than the sum of its proper divisors (73060500).

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

40399980 is a wasteful number, since it uses less digits than its factorization.

40399980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038 (or 2036 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 40399980 is about 6356.0978595361. The cubic root of 40399980 is about 343.1313377020.

The spelling of 40399980 in words is "forty million, three hundred ninety-nine thousand, nine hundred eighty".