18993154 has 8 divisors (see below), whose sum is σ = 28516860. Its totient is φ = 9487536.

The previous prime is 18993119. The next prime is 18993181. The reversal of 18993154 is 45139981.

It can be written as a sum of positive squares in 2 ways, for example, as 14645929 + 4347225 = 3827^2 + 2085^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1489 + ... + 6340.

Almost surely, 2^18993154 is an apocalyptic number.

18993154 is a deficient number, since it is larger than the sum of its proper divisors (9523706).

18993154 is a wasteful number, since it uses less digits than its factorization.

18993154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9044.

The product of its digits is 38880, while the sum is 40.

The square root of 18993154 is about 4358.1135827328. The cubic root of 18993154 is about 266.8081121140.

The spelling of 18993154 in words is "eighteen million, nine hundred ninety-three thousand, one hundred fifty-four".