13139840 has 96 divisors (see below), whose sum is σ = 36628200. Its totient is φ = 4494336.

The previous prime is 13139821. The next prime is 13139851. The reversal of 13139840 is 4893131.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31151 + ... + 31569.

Almost surely, 2^13139840 is an apocalyptic number.

13139840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13139840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18314100).

13139840 is an abundant number, since it is smaller than the sum of its proper divisors (23488360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13139840 is an equidigital number, since it uses as much as digits as its factorization.

13139840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 433 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 13139840 is about 3624.8917225208. The cubic root of 13139840 is about 235.9735678527.

The spelling of 13139840 in words is "thirteen million, one hundred thirty-nine thousand, eight hundred forty".