18975549 has 4 divisors (see below), whose sum is σ = 25300736. Its totient is φ = 12650364.

The previous prime is 18975533. The next prime is 18975557. The reversal of 18975549 is 94557981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18975549 - 2⁴ = 18975533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18975498 and 18975507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18975569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3162589 + ... + 3162594.

It is an arithmetic number, because the mean of its divisors is an integer number (6325184).

Almost surely, 2^18975549 is an apocalyptic number.

It is an amenable number.

18975549 is a deficient number, since it is larger than the sum of its proper divisors (6325187).

18975549 is an equidigital number, since it uses as much as digits as its factorization.

18975549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6325186.

The product of its digits is 453600, while the sum is 48.

The square root of 18975549 is about 4356.0933185596. The cubic root of 18975549 is about 266.7256506676.

The spelling of 18975549 in words is "eighteen million, nine hundred seventy-five thousand, five hundred forty-nine".