13558939 has 2 divisors, whose sum is σ = 13558940. Its totient is φ = 13558938.

The previous prime is 13558907. The next prime is 13558949. The reversal of 13558939 is 93985531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13558939 - 2⁵ = 13558907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13558895 and 13558904.

It is not a weakly prime, because it can be changed into another prime (13558949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6779469 + 6779470.

It is an arithmetic number, because the mean of its divisors is an integer number (6779470).

Almost surely, 2^13558939 is an apocalyptic number.

13558939 is a deficient number, since it is larger than the sum of its proper divisors (1).

13558939 is an equidigital number, since it uses as much as digits as its factorization.

13558939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 43.

The square root of 13558939 is about 3682.2464610615. The cubic root of 13558939 is about 238.4561726240.

The spelling of 13558939 in words is "thirteen million, five hundred fifty-eight thousand, nine hundred thirty-nine".