13613240 has 32 divisors (see below), whose sum is σ = 31963680. Its totient is φ = 5208192.

The previous prime is 13613239. The next prime is 13613269. The reversal of 13613240 is 4231631.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6479 + ... + 8318.

It is an arithmetic number, because the mean of its divisors is an integer number (998865).

Almost surely, 2^13613240 is an apocalyptic number.

13613240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13613240 is an abundant number, since it is smaller than the sum of its proper divisors (18350440).

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

13613240 is a wasteful number, since it uses less digits than its factorization.

13613240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14831 (or 14827 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 13613240 is about 3689.6124457726. The cubic root of 13613240 is about 238.7740726620.

Adding to 13613240 its reverse (4231631), we get a palindrome (17844871).

The spelling of 13613240 in words is "thirteen million, six hundred thirteen thousand, two hundred forty".