40640992 has 36 divisors (see below), whose sum is σ = 93078720. Its totient is φ = 17416896.

The previous prime is 40640939. The next prime is 40640993. The reversal of 40640992 is 29904604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40640993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11392 + ... + 14527.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^40640992 is an apocalyptic number.

It is an amenable number.

40640992 is an abundant number, since it is smaller than the sum of its proper divisors (52437728).

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

40640992 is a wasteful number, since it uses less digits than its factorization.

40640992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25943 (or 25928 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 40640992 is about 6375.0287842487. The cubic root of 40640992 is about 343.8123187511.

It can be divided in two parts, 406409 and 92, that multiplied together give a triangular number (37389628 = T₈₆₄₇).

The spelling of 40640992 in words is "forty million, six hundred forty thousand, nine hundred ninety-two".