13431240 has 48 divisors (see below), whose sum is σ = 43652700. Its totient is φ = 3581568.

The previous prime is 13431239. The next prime is 13431251. The reversal of 13431240 is 4213431.

13431240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 13351716 + 79524 = 3654^2 + 282^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 18295 + ... + 19014.

Almost surely, 2^13431240 is an apocalyptic number.

13431240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13431240 is an abundant number, since it is smaller than the sum of its proper divisors (30221460).

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

13431240 is a wasteful number, since it uses less digits than its factorization.

13431240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37326 (or 37319 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 13431240 is about 3664.8656182731. The cubic root of 13431240 is about 237.7052113715.

Adding to 13431240 its reverse (4213431), we get a palindrome (17644671).

The spelling of 13431240 in words is "thirteen million, four hundred thirty-one thousand, two hundred forty".