39791661 has 16 divisors (see below), whose sum is σ = 65299584. Its totient is φ = 20988864.

The previous prime is 39791659. The next prime is 39791663. The reversal of 39791661 is 16619793.

It is an interprime number because it is at equal distance from previous prime (39791659) and next prime (39791663).

It is not a de Polignac number, because 39791661 - 2¹ = 39791659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39791663) 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, 72606 + ... + 73151.

It is an arithmetic number, because the mean of its divisors is an integer number (4081224).

Almost surely, 2^39791661 is an apocalyptic number.

It is an amenable number.

39791661 is a deficient number, since it is larger than the sum of its proper divisors (25507923).

39791661 is a wasteful number, since it uses less digits than its factorization.

39791661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145780.

The product of its digits is 61236, while the sum is 42.

The square root of 39791661 is about 6308.0631734313. The cubic root of 39791661 is about 341.4003976866.

The spelling of 39791661 in words is "thirty-nine million, seven hundred ninety-one thousand, six hundred sixty-one".