18398475 has 48 divisors (see below), whose sum is σ = 34268640. Its totient is φ = 9676800.

The previous prime is 18398467. The next prime is 18398477. The reversal of 18398475 is 57489381.

It is not a de Polignac number, because 18398475 - 2³ = 18398467 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18398475.

It is not an unprimeable number, because it can be changed into a prime (18398477) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65335 + ... + 65615.

It is an arithmetic number, because the mean of its divisors is an integer number (713930).

Almost surely, 2^18398475 is an apocalyptic number.

18398475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18398475 is a deficient number, since it is larger than the sum of its proper divisors (15870165).

18398475 is a wasteful number, since it uses less digits than its factorization.

18398475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 386 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 18398475 is about 4289.3443554930. The cubic root of 18398475 is about 263.9939306456.

The spelling of 18398475 in words is "eighteen million, three hundred ninety-eight thousand, four hundred seventy-five".