39999969 has 12 divisors (see below), whose sum is σ = 59187492. Its totient is φ = 26016000.

The previous prime is 39999943. The next prime is 39999979. The reversal of 39999969 is 96999993.

It can be written as a sum of positive squares in 2 ways, for example, as 9529569 + 30470400 = 3087^2 + 5520^2 .

It is not a de Polignac number, because 39999969 - 2⁹ = 39999457 is a prime.

It is a super-2 number, since 2×39999969² = 3199995040001922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39999919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53832 + ... + 54569.

It is an arithmetic number, because the mean of its divisors is an integer number (4932291).

Almost surely, 2^39999969 is an apocalyptic number.

It is an amenable number.

39999969 is a deficient number, since it is larger than the sum of its proper divisors (19187523).

39999969 is a wasteful number, since it uses less digits than its factorization.

39999969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108448 (or 108445 counting only the distinct ones).

The product of its digits is 9565938, while the sum is 63.

The square root of 39999969 is about 6324.5528695711. The cubic root of 39999969 is about 341.9951009866.

The spelling of 39999969 in words is "thirty-nine million, nine hundred ninety-nine thousand, nine hundred sixty-nine".