13640835 has 24 divisors (see below), whose sum is σ = 23637744. Its totient is φ = 6714240.

The previous prime is 13640833. The next prime is 13640849. The reversal of 13640835 is 53804631.

It is not a de Polignac number, because 13640835 - 2¹ = 13640833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13640831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156 + ... + 5225.

It is an arithmetic number, because the mean of its divisors is an integer number (984906).

Almost surely, 2^13640835 is an apocalyptic number.

13640835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13640835 is a deficient number, since it is larger than the sum of its proper divisors (9996909).

13640835 is a wasteful number, since it uses less digits than its factorization.

13640835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415 (or 5402 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 13640835 is about 3693.3501052567. The cubic root of 13640835 is about 238.9353010798.

The spelling of 13640835 in words is "thirteen million, six hundred forty thousand, eight hundred thirty-five".