13099945 has 16 divisors (see below), whose sum is σ = 16742160. Its totient is φ = 9805824.

The previous prime is 13099937. The next prime is 13099991. The reversal of 13099945 is 54999031.

It can be written as a sum of positive squares in 8 ways, for example, as 793881 + 12306064 = 891^2 + 3508^2 .

It is a cyclic number.

It is not a de Polignac number, because 13099945 - 2³ = 13099937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13099898 and 13099907.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19129 + ... + 19801.

It is an arithmetic number, because the mean of its divisors is an integer number (1046385).

Almost surely, 2^13099945 is an apocalyptic number.

It is an amenable number.

13099945 is a deficient number, since it is larger than the sum of its proper divisors (3642215).

13099945 is a wasteful number, since it uses less digits than its factorization.

13099945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 13099945 is about 3619.3846162020. The cubic root of 13099945 is about 235.7345058521.

It can be divided in two parts, 130999 and 45, that added together give a square (131044 = 362²).

The spelling of 13099945 in words is "thirteen million, ninety-nine thousand, nine hundred forty-five".