13212740 has 24 divisors (see below), whose sum is σ = 29379672. Its totient is φ = 4974080.

The previous prime is 13212713. The next prime is 13212743. The reversal of 13212740 is 4721231.

It can be written as a sum of positive squares in 4 ways, for example, as 5271616 + 7941124 = 2296^2 + 2818^2 .

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

It is not an unprimeable number, because it can be changed into a prime (13212743) 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, 19091 + ... + 19770.

It is an arithmetic number, because the mean of its divisors is an integer number (1224153).

Almost surely, 2^13212740 is an apocalyptic number.

13212740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13212740 is an abundant number, since it is smaller than the sum of its proper divisors (16166932).

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

13212740 is a wasteful number, since it uses less digits than its factorization.

13212740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38887 (or 38885 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 13212740 is about 3634.9332868706. The cubic root of 13212740 is about 236.4091580783.

Adding to 13212740 its reverse (4721231), we get a palindrome (17933971).

The spelling of 13212740 in words is "thirteen million, two hundred twelve thousand, seven hundred forty".