13867639 has 2 divisors, whose sum is σ = 13867640. Its totient is φ = 13867638.

The previous prime is 13867589. The next prime is 13867661. The reversal of 13867639 is 93676831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13867639 - 2⁹ = 13867127 is a prime.

It is a super-2 number, since 2×13867639² = 384622822868642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13867595 and 13867604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13867669) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6933819 + 6933820.

It is an arithmetic number, because the mean of its divisors is an integer number (6933820).

Almost surely, 2^13867639 is an apocalyptic number.

13867639 is a deficient number, since it is larger than the sum of its proper divisors (1).

13867639 is an equidigital number, since it uses as much as digits as its factorization.

13867639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 13867639 is about 3723.9278994094. The cubic root of 13867639 is about 240.2522752380.

It can be divided in two parts, 1386 and 7639, that added together give a square (9025 = 95²).

The spelling of 13867639 in words is "thirteen million, eight hundred sixty-seven thousand, six hundred thirty-nine".