39937090978 has 4 divisors (see below), whose sum is σ = 59905636470. Its totient is φ = 19968545488.

The previous prime is 39937090927. The next prime is 39937090979. The reversal of 39937090978 is 87909073993.

39937090978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87909073993 = 13 ⋅6762236461.

It can be written as a sum of positive squares in only one way, i.e., 39036670929 + 900420049 = 197577^2 + 30007^2 .

It is not an unprimeable number, because it can be changed into a prime (39937090979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9984272743 + ... + 9984272746.

Almost surely, 2^39937090978 is an apocalyptic number.

39937090978 is a deficient number, since it is larger than the sum of its proper divisors (19968545492).

39937090978 is a wasteful number, since it uses less digits than its factorization.

39937090978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19968545491.

The product of its (nonzero) digits is 23147208, while the sum is 64.

The spelling of 39937090978 in words is "thirty-nine billion, nine hundred thirty-seven million, ninety thousand, nine hundred seventy-eight".