39764991 has 16 divisors (see below), whose sum is σ = 60971264. Its totient is φ = 22581504.

The previous prime is 39764951. The next prime is 39765001. The reversal of 39764991 is 19946793.

It is not a de Polignac number, because 39764991 - 2⁶ = 39764927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39764991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39764911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2386 + ... + 9231.

It is an arithmetic number, because the mean of its divisors is an integer number (3810704).

Almost surely, 2^39764991 is an apocalyptic number.

39764991 is a deficient number, since it is larger than the sum of its proper divisors (21206273).

39764991 is a wasteful number, since it uses less digits than its factorization.

39764991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11790.

The product of its digits is 367416, while the sum is 48.

The square root of 39764991 is about 6305.9488580229. The cubic root of 39764991 is about 341.3241071327.

It can be divided in two parts, 39764 and 991, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 39764991 in words is "thirty-nine million, seven hundred sixty-four thousand, nine hundred ninety-one".