39047978 has 8 divisors (see below), whose sum is σ = 60591780. Its totient is φ = 18850720.

The previous prime is 39047977. The next prime is 39047993. The reversal of 39047978 is 87974093.

39047978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 33953929 + 5094049 = 5827^2 + 2257^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (39047971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336563 + ... + 336678.

Almost surely, 2^39047978 is an apocalyptic number.

39047978 is a deficient number, since it is larger than the sum of its proper divisors (21543802).

39047978 is a wasteful number, since it uses less digits than its factorization.

39047978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673272.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 39047978 is about 6248.8381320050. The cubic root of 39047978 is about 339.2601501720.

The spelling of 39047978 in words is "thirty-nine million, forty-seven thousand, nine hundred seventy-eight".