39399040 has 32 divisors (see below), whose sum is σ = 94189860. Its totient is φ = 15759360.

The previous prime is 39399029. The next prime is 39399067. The reversal of 39399040 is 4099393.

It can be written as a sum of positive squares in 2 ways, for example, as 38638656 + 760384 = 6216^2 + 872^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30141 + ... + 31420.

Almost surely, 2^39399040 is an apocalyptic number.

It is an amenable number.

39399040 is an abundant number, since it is smaller than the sum of its proper divisors (54790820).

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

39399040 is an equidigital number, since it uses as much as digits as its factorization.

39399040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61580 (or 61568 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 39399040 is about 6276.8654597657. The cubic root of 39399040 is about 340.2738278493.

The spelling of 39399040 in words is "thirty-nine million, three hundred ninety-nine thousand, forty".