39991372 has 12 divisors (see below), whose sum is σ = 70390656. Its totient is φ = 19879760.

The previous prime is 39991363. The next prime is 39991373. The reversal of 39991372 is 27319993.

It is a super-3 number, since 3×39991372³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (39991373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28204 + ... + 29587.

It is an arithmetic number, because the mean of its divisors is an integer number (5865888).

Almost surely, 2^39991372 is an apocalyptic number.

It is an amenable number.

39991372 is a deficient number, since it is larger than the sum of its proper divisors (30399284).

39991372 is a wasteful number, since it uses less digits than its factorization.

39991372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57968 (or 57966 counting only the distinct ones).

The product of its digits is 91854, while the sum is 43.

The square root of 39991372 is about 6323.8731802591. The cubic root of 39991372 is about 341.9705981130.

The spelling of 39991372 in words is "thirty-nine million, nine hundred ninety-one thousand, three hundred seventy-two".