13619945 has 4 divisors (see below), whose sum is σ = 16343940. Its totient is φ = 10895952.

The previous prime is 13619927. The next prime is 13619953. The reversal of 13619945 is 54991631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54991631 = 2243 ⋅24517.

It can be written as a sum of positive squares in 2 ways, for example, as 6416089 + 7203856 = 2533^2 + 2684^2 .

It is a cyclic number.

It is not a de Polignac number, because 13619945 - 2²² = 9425641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13619899 and 13619908.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1361990 + ... + 1361999.

It is an arithmetic number, because the mean of its divisors is an integer number (4085985).

Almost surely, 2^13619945 is an apocalyptic number.

It is an amenable number.

13619945 is a deficient number, since it is larger than the sum of its proper divisors (2723995).

13619945 is an equidigital number, since it uses as much as digits as its factorization.

13619945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2723994.

The product of its digits is 29160, while the sum is 38.

The square root of 13619945 is about 3690.5209659342. The cubic root of 13619945 is about 238.8132677736.

The spelling of 13619945 in words is "thirteen million, six hundred nineteen thousand, nine hundred forty-five".