18890773 has 4 divisors (see below), whose sum is σ = 20608128. Its totient is φ = 17173420.

The previous prime is 18890771. The next prime is 18890779. The reversal of 18890773 is 37709881.

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 18890773 - 2¹ = 18890771 is a prime.

It is a super-2 number, since 2×18890773² = 713722609075058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18890771) 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, 858661 + ... + 858682.

It is an arithmetic number, because the mean of its divisors is an integer number (5152032).

Almost surely, 2^18890773 is an apocalyptic number.

It is an amenable number.

18890773 is a deficient number, since it is larger than the sum of its proper divisors (1717355).

18890773 is a wasteful number, since it uses less digits than its factorization.

18890773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717354.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 18890773 is about 4346.3516884854. The cubic root of 18890773 is about 266.3278458994.

The spelling of 18890773 in words is "eighteen million, eight hundred ninety thousand, seven hundred seventy-three".