13609945 has 8 divisors (see below), whose sum is σ = 17292744. Its totient is φ = 10247424.

The previous prime is 13609927. The next prime is 13609957. The reversal of 13609945 is 54990631.

It can be written as a sum of positive squares in 4 ways, for example, as 1478656 + 12131289 = 1216^2 + 3483^2 .

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 13609945 - 2⁹ = 13609433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79974 + ... + 80143.

It is an arithmetic number, because the mean of its divisors is an integer number (2161593).

Almost surely, 2^13609945 is an apocalyptic number.

It is an amenable number.

13609945 is a deficient number, since it is larger than the sum of its proper divisors (3682799).

13609945 is a wasteful number, since it uses less digits than its factorization.

13609945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160139.

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

The square root of 13609945 is about 3689.1658948874. The cubic root of 13609945 is about 238.7548065149.

The spelling of 13609945 in words is "thirteen million, six hundred nine thousand, nine hundred forty-five".