13402540 has 24 divisors (see below), whose sum is σ = 29054592. Its totient is φ = 5187840.

The previous prime is 13402517. The next prime is 13402549. The reversal of 13402540 is 4520431.

It is not an unprimeable number, because it can be changed into a prime (13402549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10189 + ... + 11428.

It is an arithmetic number, because the mean of its divisors is an integer number (1210608).

Almost surely, 2^13402540 is an apocalyptic number.

13402540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13402540 is an abundant number, since it is smaller than the sum of its proper divisors (15652052).

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

13402540 is a wasteful number, since it uses less digits than its factorization.

13402540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21657 (or 21655 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 13402540 is about 3660.9479646671. The cubic root of 13402540 is about 237.5357803895.

Adding to 13402540 its reverse (4520431), we get a palindrome (17922971).

The spelling of 13402540 in words is "thirteen million, four hundred two thousand, five hundred forty".