12409639 has 6 divisors (see below), whose sum is σ = 13640480. Its totient is φ = 11281380.

The previous prime is 12409637. The next prime is 12409667. The reversal of 12409639 is 93690421.

It is not a de Polignac number, because 12409639 - 2¹ = 12409637 is a prime.

It is a super-2 number, since 2×12409639² = 307998280220642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12409637) 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, 51159 + ... + 51400.

Almost surely, 2^12409639 is an apocalyptic number.

12409639 is a deficient number, since it is larger than the sum of its proper divisors (1230841).

12409639 is a wasteful number, since it uses less digits than its factorization.

12409639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102581 (or 102570 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 12409639 is about 3522.7317524898. The cubic root of 12409639 is about 231.5188639082.

The spelling of 12409639 in words is "twelve million, four hundred nine thousand, six hundred thirty-nine".