18940245 has 16 divisors (see below), whose sum is σ = 31899840. Its totient is φ = 9569664.

The previous prime is 18940241. The next prime is 18940249. The reversal of 18940245 is 54204981.

It is an interprime number because it is at equal distance from previous prime (18940241) and next prime (18940249).

It is not a de Polignac number, because 18940245 - 2² = 18940241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18940241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32944 + ... + 33513.

It is an arithmetic number, because the mean of its divisors is an integer number (1993740).

Almost surely, 2^18940245 is an apocalyptic number.

18940245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18940245 is a deficient number, since it is larger than the sum of its proper divisors (12959595).

18940245 is a wasteful number, since it uses less digits than its factorization.

18940245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66484.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 18940245 is about 4352.0391772134. The cubic root of 18940245 is about 266.5601336611.

The spelling of 18940245 in words is "eighteen million, nine hundred forty thousand, two hundred forty-five".