18442545 has 16 divisors (see below), whose sum is σ = 32190912. Its totient is φ = 8941760.

The previous prime is 18442537. The next prime is 18442547. The reversal of 18442545 is 54524481.

It is a happy number.

It is not a de Polignac number, because 18442545 - 2³ = 18442537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (18442547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55722 + ... + 56051.

It is an arithmetic number, because the mean of its divisors is an integer number (2011932).

Almost surely, 2^18442545 is an apocalyptic number.

18442545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18442545 is a deficient number, since it is larger than the sum of its proper divisors (13748367).

18442545 is a wasteful number, since it uses less digits than its factorization.

18442545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111792.

The product of its digits is 25600, while the sum is 33.

The square root of 18442545 is about 4294.4784316608. The cubic root of 18442545 is about 264.2045447625.

The spelling of 18442545 in words is "eighteen million, four hundred forty-two thousand, five hundred forty-five".