13740639 has 12 divisors (see below), whose sum is σ = 20138328. Its totient is φ = 8327440.

The previous prime is 13740599. The next prime is 13740673. The reversal of 13740639 is 93604731.

It is not a de Polignac number, because 13740639 - 2⁸ = 13740383 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13740679) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18564 + ... + 19289.

It is an arithmetic number, because the mean of its divisors is an integer number (1678194).

Almost surely, 2^13740639 is an apocalyptic number.

13740639 is a deficient number, since it is larger than the sum of its proper divisors (6397689).

13740639 is a wasteful number, since it uses less digits than its factorization.

13740639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37878 (or 37867 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 13740639 is about 3706.8367916594. The cubic root of 13740639 is about 239.5166138669.

The spelling of 13740639 in words is "thirteen million, seven hundred forty thousand, six hundred thirty-nine".