39939860 has 24 divisors (see below), whose sum is σ = 84056616. Its totient is φ = 15941120.

The previous prime is 39939859. The next prime is 39939869. The reversal of 39939860 is 6893993.

It can be written as a sum of positive squares in 4 ways, for example, as 148996 + 39790864 = 386^2 + 6308^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39939869) 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, 8504 + ... + 12336.

It is an arithmetic number, because the mean of its divisors is an integer number (3502359).

Almost surely, 2^39939860 is an apocalyptic number.

It is an amenable number.

39939860 is an abundant number, since it is smaller than the sum of its proper divisors (44116756).

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

39939860 is a wasteful number, since it uses less digits than its factorization.

39939860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363 (or 4361 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 39939860 is about 6319.7990474381. The cubic root of 39939860 is about 341.8237067762.

The spelling of 39939860 in words is "thirty-nine million, nine hundred thirty-nine thousand, eight hundred sixty".