15138535 has 12 divisors (see below), whose sum is σ = 19174968. Its totient is φ = 11472048.

The previous prime is 15138523. The next prime is 15138581. The reversal of 15138535 is 53583151.

It is not a de Polignac number, because 15138535 - 2⁹ = 15138023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15138497 and 15138506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2389 + ... + 5998.

It is an arithmetic number, because the mean of its divisors is an integer number (1597914).

Almost surely, 2^15138535 is an apocalyptic number.

15138535 is a deficient number, since it is larger than the sum of its proper divisors (4036433).

15138535 is an equidigital number, since it uses as much as digits as its factorization.

15138535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8430 (or 8411 counting only the distinct ones).

The product of its digits is 9000, while the sum is 31.

The square root of 15138535 is about 3890.8270329070. The cubic root of 15138535 is about 247.3781190872.

The spelling of 15138535 in words is "fifteen million, one hundred thirty-eight thousand, five hundred thirty-five".