13640980 has 12 divisors (see below), whose sum is σ = 28646100. Its totient is φ = 5456384.

The previous prime is 13640947. The next prime is 13640989. The reversal of 13640980 is 8904631.

It can be written as a sum of positive squares in 2 ways, for example, as 1710864 + 11930116 = 1308^2 + 3454^2 .

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341005 + ... + 341044.

It is an arithmetic number, because the mean of its divisors is an integer number (2387175).

Almost surely, 2^13640980 is an apocalyptic number.

13640980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13640980 is an abundant number, since it is smaller than the sum of its proper divisors (15005120).

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

13640980 is a wasteful number, since it uses less digits than its factorization.

13640980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682058 (or 682056 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 13640980 is about 3693.3697350793. The cubic root of 13640980 is about 238.9361476921.

The spelling of 13640980 in words is "thirteen million, six hundred forty thousand, nine hundred eighty".