18077493 has 16 divisors (see below), whose sum is σ = 28997120. Its totient is φ = 9786096.

The previous prime is 18077473. The next prime is 18077503. The reversal of 18077493 is 39477081.

It is not a de Polignac number, because 18077493 - 2⁵ = 18077461 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18077473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22255 + ... + 23052.

It is an arithmetic number, because the mean of its divisors is an integer number (1812320).

Almost surely, 2^18077493 is an apocalyptic number.

It is an amenable number.

18077493 is a deficient number, since it is larger than the sum of its proper divisors (10919627).

18077493 is a wasteful number, since it uses less digits than its factorization.

18077493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45336.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 18077493 is about 4251.7635164717. The cubic root of 18077493 is about 262.4496919464.

The spelling of 18077493 in words is "eighteen million, seventy-seven thousand, four hundred ninety-three".