13215740 has 12 divisors (see below), whose sum is σ = 27753096. Its totient is φ = 5286288.

The previous prime is 13215739. The next prime is 13215751. The reversal of 13215740 is 4751231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330374 + ... + 330413.

It is an arithmetic number, because the mean of its divisors is an integer number (2312758).

Almost surely, 2^13215740 is an apocalyptic number.

13215740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13215740 is an abundant number, since it is smaller than the sum of its proper divisors (14537356).

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

13215740 is a wasteful number, since it uses less digits than its factorization.

13215740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660796 (or 660794 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 13215740 is about 3635.3459257683. The cubic root of 13215740 is about 236.4270492400.

Adding to 13215740 its reverse (4751231), we get a palindrome (17966971).

The spelling of 13215740 in words is "thirteen million, two hundred fifteen thousand, seven hundred forty".