18440245 has 16 divisors (see below), whose sum is σ = 22872960. Its totient is φ = 14261184.

The previous prime is 18440231. The next prime is 18440251. The reversal of 18440245 is 54204481.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18440245 is a prime.

It is a congruent number.

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, 48466 + ... + 48844.

It is an arithmetic number, because the mean of its divisors is an integer number (1429560).

Almost surely, 2^18440245 is an apocalyptic number.

It is an amenable number.

18440245 is a deficient number, since it is larger than the sum of its proper divisors (4432715).

18440245 is a wasteful number, since it uses less digits than its factorization.

18440245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 18440245 is about 4294.2106375910. The cubic root of 18440245 is about 264.1935611787.

The spelling of 18440245 in words is "eighteen million, four hundred forty thousand, two hundred forty-five".