18858494 has 4 divisors (see below), whose sum is σ = 28287744. Its totient is φ = 9429246.

The previous prime is 18858473. The next prime is 18858503. The reversal of 18858494 is 49485881.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4714622 + ... + 4714625.

It is an arithmetic number, because the mean of its divisors is an integer number (7071936).

Almost surely, 2^18858494 is an apocalyptic number.

18858494 is a deficient number, since it is larger than the sum of its proper divisors (9429250).

18858494 is an equidigital number, since it uses as much as digits as its factorization.

18858494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9429249.

The product of its digits is 368640, while the sum is 47.

The square root of 18858494 is about 4342.6367566261. The cubic root of 18858494 is about 266.1760663739.

The spelling of 18858494 in words is "eighteen million, eight hundred fifty-eight thousand, four hundred ninety-four".