18219475 has 12 divisors (see below), whose sum is σ = 23321920. Its totient is φ = 14104800.

The previous prime is 18219451. The next prime is 18219479. The reversal of 18219475 is 57491281.

It is not a de Polignac number, because 18219475 - 2¹¹ = 18217427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18219479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10980 + ... + 12529.

Almost surely, 2^18219475 is an apocalyptic number.

18219475 is a deficient number, since it is larger than the sum of its proper divisors (5102445).

18219475 is a wasteful number, since it uses less digits than its factorization.

18219475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23550 (or 23545 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 18219475 is about 4268.4276964709. The cubic root of 18219475 is about 263.1350008329.

The spelling of 18219475 in words is "eighteen million, two hundred nineteen thousand, four hundred seventy-five".