39988161 has 20 divisors (see below), whose sum is σ = 61197444. Its totient is φ = 26006400.

The previous prime is 39988139. The next prime is 39988181. The reversal of 39988161 is 16188993.

It can be written as a sum of positive squares in 2 ways, for example, as 11696400 + 28291761 = 3420^2 + 5319^2 .

It is not a de Polignac number, because 39988161 - 2¹¹ = 39986113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39988111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2700 + ... + 9341.

Almost surely, 2^39988161 is an apocalyptic number.

It is an amenable number.

39988161 is a deficient number, since it is larger than the sum of its proper divisors (21209283).

39988161 is a wasteful number, since it uses less digits than its factorization.

39988161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12094 (or 12085 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 39988161 is about 6323.6192959412. The cubic root of 39988161 is about 341.9614453306.

The spelling of 39988161 in words is "thirty-nine million, nine hundred eighty-eight thousand, one hundred sixty-one".