18888945 has 32 divisors (see below), whose sum is σ = 32071680. Its totient is φ = 9466560.

The previous prime is 18888941. The next prime is 18888949. The reversal of 18888945 is 54988881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18888941) and next prime (18888949).

It is not a de Polignac number, because 18888945 - 2² = 18888941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18888941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54262 + ... + 54608.

It is an arithmetic number, because the mean of its divisors is an integer number (1002240).

Almost surely, 2^18888945 is an apocalyptic number.

18888945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18888945 is a deficient number, since it is larger than the sum of its proper divisors (13182735).

18888945 is a wasteful number, since it uses less digits than its factorization.

18888945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565.

The product of its digits is 737280, while the sum is 51.

The square root of 18888945 is about 4346.1413920856. The cubic root of 18888945 is about 266.3192550562.

The spelling of 18888945 in words is "eighteen million, eight hundred eighty-eight thousand, nine hundred forty-five".