13906989945 has 12 divisors (see below), whose sum is σ = 24105449316. Its totient is φ = 7417061280.

The previous prime is 13906989937. The next prime is 13906990001. The reversal of 13906989945 is 54998960931.

It can be written as a sum of positive squares in 2 ways, for example, as 6680119824 + 7226870121 = 81732^2 + 85011^2 .

It is not a de Polignac number, because 13906989945 - 2³ = 13906989937 is a prime.

It is a super-2 number, since 2×13906989945² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154522066 + ... + 154522155.

It is an arithmetic number, because the mean of its divisors is an integer number (2008787443).

Almost surely, 2^13906989945 is an apocalyptic number.

13906989945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13906989945 is a deficient number, since it is larger than the sum of its proper divisors (10198459371).

13906989945 is a wasteful number, since it uses less digits than its factorization.

13906989945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309044232 (or 309044229 counting only the distinct ones).

The product of its (nonzero) digits is 18895680, while the sum is 63.

The spelling of 13906989945 in words is "thirteen billion, nine hundred six million, nine hundred eighty-nine thousand, nine hundred forty-five".