13640139 has 6 divisors (see below), whose sum is σ = 19702436. Its totient is φ = 9093420.

The previous prime is 13640129. The next prime is 13640141. The reversal of 13640139 is 93104631.

13640139 is a `hidden beast` number, since 1 + 3 + 640 + 13 + 9 = 666.

It is not a de Polignac number, because 13640139 - 2¹² = 13636043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13640129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 757777 + ... + 757794.

Almost surely, 2^13640139 is an apocalyptic number.

13640139 is a deficient number, since it is larger than the sum of its proper divisors (6062297).

13640139 is a wasteful number, since it uses less digits than its factorization.

13640139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515577 (or 1515574 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 13640139 is about 3693.2558806560. The cubic root of 13640139 is about 238.9312372573.

The spelling of 13640139 in words is "thirteen million, six hundred forty thousand, one hundred thirty-nine".