18745545 has 64 divisors (see below), whose sum is σ = 38191104. Its totient is φ = 7637760.

The previous prime is 18745537. The next prime is 18745561. The reversal of 18745545 is 54554781.

It is not a de Polignac number, because 18745545 - 2³ = 18745537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42094 + ... + 42536.

It is an arithmetic number, because the mean of its divisors is an integer number (596736).

Almost surely, 2^18745545 is an apocalyptic number.

18745545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18745545 is an abundant number, since it is smaller than the sum of its proper divisors (19445559).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18745545 is a wasteful number, since it uses less digits than its factorization.

18745545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502.

The product of its digits is 112000, while the sum is 39.

The square root of 18745545 is about 4329.6125692722. The cubic root of 18745545 is about 265.6435999893.

The spelling of 18745545 in words is "eighteen million, seven hundred forty-five thousand, five hundred forty-five".