13691240 has 16 divisors (see below), whose sum is σ = 30805380. Its totient is φ = 5476480.

The previous prime is 13691213. The next prime is 13691269. The reversal of 13691240 is 4219631.

It can be written as a sum of positive squares in 2 ways, for example, as 12773476 + 917764 = 3574^2 + 958^2 .

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 3 ways as a sum of consecutive naturals, for example, 171101 + ... + 171180.

Almost surely, 2^13691240 is an apocalyptic number.

13691240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13691240 is an abundant number, since it is smaller than the sum of its proper divisors (17114140).

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

13691240 is a wasteful number, since it uses less digits than its factorization.

13691240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342292 (or 342288 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 13691240 is about 3700.1675637733. The cubic root of 13691240 is about 239.2292403191.

It can be divided in two parts, 13691 and 240, that added together give a palindrome (13931).

The spelling of 13691240 in words is "thirteen million, six hundred ninety-one thousand, two hundred forty".