13139505 has 24 divisors (see below), whose sum is σ = 23512320. Its totient is φ = 6780960.

The previous prime is 13139471. The next prime is 13139519. The reversal of 13139505 is 50593131.

13139505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13139505 - 2⁷ = 13139377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3315 + ... + 6104.

It is an arithmetic number, because the mean of its divisors is an integer number (979680).

Almost surely, 2^13139505 is an apocalyptic number.

13139505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13139505 is a deficient number, since it is larger than the sum of its proper divisors (10372815).

13139505 is a wasteful number, since it uses less digits than its factorization.

13139505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9461 (or 9458 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 27.

The square root of 13139505 is about 3624.8455139495. The cubic root of 13139505 is about 235.9715624549.

The spelling of 13139505 in words is "thirteen million, one hundred thirty-nine thousand, five hundred five".