39981169 has 16 divisors (see below), whose sum is σ = 42653520. Its totient is φ = 37416960.

The previous prime is 39981167. The next prime is 39981181. The reversal of 39981169 is 96118993.

It can be written as a sum of positive squares in 8 ways, for example, as 8340544 + 31640625 = 2888^2 + 5625^2 .

It is not a de Polignac number, because 39981169 - 2¹ = 39981167 is a prime.

It is a super-2 number, since 2×39981169² = 3196987749213122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39981163) 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, 171477 + ... + 171709.

It is an arithmetic number, because the mean of its divisors is an integer number (2665845).

Almost surely, 2^39981169 is an apocalyptic number.

It is an amenable number.

39981169 is a deficient number, since it is larger than the sum of its proper divisors (2672351).

39981169 is a wasteful number, since it uses less digits than its factorization.

39981169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420.

The product of its digits is 104976, while the sum is 46.

The square root of 39981169 is about 6323.0664238168. The cubic root of 39981169 is about 341.9415133163.

The spelling of 39981169 in words is "thirty-nine million, nine hundred eighty-one thousand, one hundred sixty-nine".