13640811 has 4 divisors (see below), whose sum is σ = 18187752. Its totient is φ = 9093872.

The previous prime is 13640807. The next prime is 13640813. The reversal of 13640811 is 11804631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11804631 = 3 ⋅3934877.

It is a cyclic number.

It is not a de Polignac number, because 13640811 - 2² = 13640807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13640813) 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, 2273466 + ... + 2273471.

It is an arithmetic number, because the mean of its divisors is an integer number (4546938).

Almost surely, 2^13640811 is an apocalyptic number.

13640811 is a deficient number, since it is larger than the sum of its proper divisors (4546941).

13640811 is an equidigital number, since it uses as much as digits as its factorization.

13640811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4546940.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 13640811 is about 3693.3468561726. The cubic root of 13640811 is about 238.9351609503.

The spelling of 13640811 in words is "thirteen million, six hundred forty thousand, eight hundred eleven".