39445690 has 64 divisors (see below), whose sum is σ = 78382080. Its totient is φ = 14248960.

The previous prime is 39445687. The next prime is 39445697. The reversal of 39445690 is 9654493.

It is a super-2 number, since 2×39445690² = 3111924919152200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39445697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 443166 + ... + 443254.

It is an arithmetic number, because the mean of its divisors is an integer number (1224720).

It is a vampire number, since it can be written as 4094 ⋅ 9635 (with its own digits).

Almost surely, 2^39445690 is an apocalyptic number.

39445690 is a deficient number, since it is larger than the sum of its proper divisors (38936390).

39445690 is a wasteful number, since it uses less digits than its factorization.

39445690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 39445690 is about 6280.5803871935. The cubic root of 39445690 is about 340.4080740402.

The spelling of 39445690 in words is "thirty-nine million, four hundred forty-five thousand, six hundred ninety".