40397990 has 32 divisors (see below), whose sum is σ = 77436000. Its totient is φ = 15130368.

The previous prime is 40397953. The next prime is 40398013. The reversal of 40397990 is 9979304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15716 + ... + 18104.

It is an arithmetic number, because the mean of its divisors is an integer number (2419875).

Almost surely, 2^40397990 is an apocalyptic number.

40397990 is a deficient number, since it is larger than the sum of its proper divisors (37038010).

40397990 is a wasteful number, since it uses less digits than its factorization.

40397990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 40397990 is about 6355.9413150217. The cubic root of 40397990 is about 343.1257036846.

The spelling of 40397990 in words is "forty million, three hundred ninety-seven thousand, nine hundred ninety".