39943968 has 48 divisors (see below), whose sum is σ = 105325920. Its totient is φ = 13254656.

The previous prime is 39943873. The next prime is 39943973. The reversal of 39943968 is 86934993.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 39943968.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23863 + ... + 25481.

It is an arithmetic number, because the mean of its divisors is an integer number (2194290).

Almost surely, 2^39943968 is an apocalyptic number.

It is an amenable number.

39943968 is an abundant number, since it is smaller than the sum of its proper divisors (65381952).

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

39943968 is a wasteful number, since it uses less digits than its factorization.

39943968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889 (or 1881 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 51.

The square root of 39943968 is about 6320.1240494155. The cubic root of 39943968 is about 341.8354257594.

Subtracting 39943968 from its reverse (86934993), we obtain a square (46991025 = 6855²).

The spelling of 39943968 in words is "thirty-nine million, nine hundred forty-three thousand, nine hundred sixty-eight".