13861639 has 12 divisors (see below), whose sum is σ = 15390760. Its totient is φ = 12474000.

The previous prime is 13861633. The next prime is 13861651. The reversal of 13861639 is 93616831.

It is not a de Polignac number, because 13861639 - 2⁵ = 13861607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13861598 and 13861607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13861633) 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 11 ways as a sum of consecutive naturals, for example, 12664 + ... + 13714.

Almost surely, 2^13861639 is an apocalyptic number.

13861639 is a deficient number, since it is larger than the sum of its proper divisors (1529121).

13861639 is a wasteful number, since it uses less digits than its factorization.

13861639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182 (or 1171 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 13861639 is about 3723.1222112630. The cubic root of 13861639 is about 240.2176208988.

It can be divided in two parts, 1386 and 1639, that added together give a square (3025 = 55²).

The spelling of 13861639 in words is "thirteen million, eight hundred sixty-one thousand, six hundred thirty-nine".