39945880 has 32 divisors (see below), whose sum is σ = 96793200. Its totient is φ = 14749056.

The previous prime is 39945859. The next prime is 39945881. The reversal of 39945880 is 8854993.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 39945880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39945881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37890 + ... + 38929.

Almost surely, 2^39945880 is an apocalyptic number.

It is an amenable number.

39945880 is an abundant number, since it is smaller than the sum of its proper divisors (56847320).

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

39945880 is a wasteful number, since it uses less digits than its factorization.

39945880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76843 (or 76839 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 39945880 is about 6320.2753104592. The cubic root of 39945880 is about 341.8408798905.

The spelling of 39945880 in words is "thirty-nine million, nine hundred forty-five thousand, eight hundred eighty".