13640655 has 32 divisors (see below), whose sum is σ = 25127424. Its totient is φ = 6189696.

The previous prime is 13640639. The next prime is 13640677. The reversal of 13640655 is 55604631.

13640655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13640655 - 2⁴ = 13640639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16717 + ... + 17513.

It is an arithmetic number, because the mean of its divisors is an integer number (785232).

Almost surely, 2^13640655 is an apocalyptic number.

13640655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13640655 is a deficient number, since it is larger than the sum of its proper divisors (11486769).

13640655 is a wasteful number, since it uses less digits than its factorization.

13640655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 13640655 is about 3693.3257370560. The cubic root of 13640655 is about 238.9342501045.

The spelling of 13640655 in words is "thirteen million, six hundred forty thousand, six hundred fifty-five".