13906945 has 8 divisors (see below), whose sum is σ = 17972136. Its totient is φ = 10269696.

The previous prime is 13906943. The next prime is 13906999. The reversal of 13906945 is 54960931.

It can be written as a sum of positive squares in 4 ways, for example, as 135424 + 13771521 = 368^2 + 3711^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 13906945 - 2¹ = 13906943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13906943) 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, 106912 + ... + 107041.

It is an arithmetic number, because the mean of its divisors is an integer number (2246517).

Almost surely, 2^13906945 is an apocalyptic number.

It is an amenable number.

13906945 is a deficient number, since it is larger than the sum of its proper divisors (4065191).

13906945 is a wasteful number, since it uses less digits than its factorization.

13906945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213971.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 13906945 is about 3729.2016571915. The cubic root of 13906945 is about 240.4790489513.

The spelling of 13906945 in words is "thirteen million, nine hundred six thousand, nine hundred forty-five".