39749978 has 16 divisors (see below), whose sum is σ = 63305064. Its totient is φ = 18654720.

The previous prime is 39749971. The next prime is 39750013. The reversal of 39749978 is 87994793.

39749978 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 4 ways, for example, as 19562929 + 20187049 = 4423^2 + 4493^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39749971) 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 7 ways as a sum of consecutive naturals, for example, 12926 + ... + 15702.

Almost surely, 2^39749978 is an apocalyptic number.

39749978 is a deficient number, since it is larger than the sum of its proper divisors (23555086).

39749978 is a wasteful number, since it uses less digits than its factorization.

39749978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217.

The product of its digits is 3429216, while the sum is 56.

The square root of 39749978 is about 6304.7583617455. The cubic root of 39749978 is about 341.2811468661.

The spelling of 39749978 in words is "thirty-nine million, seven hundred forty-nine thousand, nine hundred seventy-eight".