13431540 has 48 divisors (see below), whose sum is σ = 39247488. Its totient is φ = 3425664.

The previous prime is 13431533. The next prime is 13431541. The reversal of 13431540 is 4513431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13431541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3487 + ... + 6246.

It is an arithmetic number, because the mean of its divisors is an integer number (817656).

Almost surely, 2^13431540 is an apocalyptic number.

13431540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13431540 is an abundant number, since it is smaller than the sum of its proper divisors (25815948).

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

13431540 is a wasteful number, since it uses less digits than its factorization.

13431540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9768 (or 9766 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 13431540 is about 3664.9065472396. The cubic root of 13431540 is about 237.7069811518.

Adding to 13431540 its reverse (4513431), we get a palindrome (17944971).

The spelling of 13431540 in words is "thirteen million, four hundred thirty-one thousand, five hundred forty".