39998169 has 6 divisors (see below), whose sum is σ = 57775146. Its totient is φ = 26665440.

The previous prime is 39998143. The next prime is 39998171. The reversal of 39998169 is 96189993.

39998169 is a `hidden beast` number, since 399 + 98 + 169 = 666.

It can be written as a sum of positive squares in only one way, i.e., 32626944 + 7371225 = 5712^2 + 2715^2 .

It is not a de Polignac number, because 39998169 - 2⁵ = 39998137 is a prime.

It is a super-2 number, since 2×39998169² = 3199707046705122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39998069) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2222112 + ... + 2222129.

It is an arithmetic number, because the mean of its divisors is an integer number (9629191).

Almost surely, 2^39998169 is an apocalyptic number.

It is an amenable number.

39998169 is a deficient number, since it is larger than the sum of its proper divisors (17776977).

39998169 is a wasteful number, since it uses less digits than its factorization.

39998169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444247 (or 4444244 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 39998169 is about 6324.4105654203. The cubic root of 39998169 is about 341.9899709791.

The spelling of 39998169 in words is "thirty-nine million, nine hundred ninety-eight thousand, one hundred sixty-nine".