18775493 has 4 divisors (see below), whose sum is σ = 20482368. Its totient is φ = 17068620.

The previous prime is 18775469. The next prime is 18775501. The reversal of 18775493 is 39457781.

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 a cyclic number.

It is not a de Polignac number, because 18775493 - 2²⁴ = 1998277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18775403) 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, 853421 + ... + 853442.

It is an arithmetic number, because the mean of its divisors is an integer number (5120592).

Almost surely, 2^18775493 is an apocalyptic number.

It is an amenable number.

18775493 is a deficient number, since it is larger than the sum of its proper divisors (1706875).

18775493 is a wasteful number, since it uses less digits than its factorization.

18775493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706874.

The product of its digits is 211680, while the sum is 44.

The square root of 18775493 is about 4333.0696971085. The cubic root of 18775493 is about 265.7849893471.

The spelling of 18775493 in words is "eighteen million, seven hundred seventy-five thousand, four hundred ninety-three".