13970639 has 8 divisors (see below), whose sum is σ = 14316720. Its totient is φ = 13628736.

The previous prime is 13970633. The next prime is 13970653. The reversal of 13970639 is 93607931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13970639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13970633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6347 + ... + 8259.

It is an arithmetic number, because the mean of its divisors is an integer number (1789590).

Almost surely, 2^13970639 is an apocalyptic number.

13970639 is a deficient number, since it is larger than the sum of its proper divisors (346081).

13970639 is a wasteful number, since it uses less digits than its factorization.

13970639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089.

The product of its (nonzero) digits is 30618, while the sum is 38.

The square root of 13970639 is about 3737.7317988320. The cubic root of 13970639 is about 240.8456223367.

The spelling of 13970639 in words is "thirteen million, nine hundred seventy thousand, six hundred thirty-nine".