40635990 has 48 divisors (see below), whose sum is σ = 108517968. Its totient is φ = 10542528.

The previous prime is 40635979. The next prime is 40635997. The reversal of 40635990 is 9953604.

40635990 is a `hidden beast` number, since 4 + 0 + 63 + 599 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40635997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2772 + ... + 9431.

It is an arithmetic number, because the mean of its divisors is an integer number (2260791).

Almost surely, 2^40635990 is an apocalyptic number.

40635990 is an abundant number, since it is smaller than the sum of its proper divisors (67881978).

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

40635990 is a wasteful number, since it uses less digits than its factorization.

40635990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12253 (or 12250 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 40635990 is about 6374.6364602227. The cubic root of 40635990 is about 343.7982129620.

The spelling of 40635990 in words is "forty million, six hundred thirty-five thousand, nine hundred ninety".