39513940 has 24 divisors (see below), whose sum is σ = 83101032. Its totient is φ = 15782400.

The previous prime is 39513937. The next prime is 39513941. The reversal of 39513940 is 4931593.

It can be written as a sum of positive squares in 4 ways, for example, as 144 + 39513796 = 12^2 + 6286^2 .

It is a super-2 number, since 2×39513940² = 3122702908647200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 39513896 and 39513905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39513941) 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, 21040 + ... + 22840.

It is an arithmetic number, because the mean of its divisors is an integer number (3462543).

Almost surely, 2^39513940 is an apocalyptic number.

It is an amenable number.

39513940 is an abundant number, since it is smaller than the sum of its proper divisors (43587092).

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

39513940 is a wasteful number, since it uses less digits than its factorization.

39513940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2907 (or 2905 counting only the distinct ones).

The product of its (nonzero) digits is 14580, while the sum is 34.

The square root of 39513940 is about 6286.0114540144. The cubic root of 39513940 is about 340.6042886714.

The spelling of 39513940 in words is "thirty-nine million, five hundred thirteen thousand, nine hundred forty".