18979154 has 4 divisors (see below), whose sum is σ = 28468734. Its totient is φ = 9489576.

The previous prime is 18979153. The next prime is 18979171. The reversal of 18979154 is 45197981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45197981 = 2287 ⋅19763.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 273529 = 4325^2 + 523^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18979153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4744787 + ... + 4744790.

Almost surely, 2^18979154 is an apocalyptic number.

18979154 is a deficient number, since it is larger than the sum of its proper divisors (9489580).

18979154 is an equidigital number, since it uses as much as digits as its factorization.

18979154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9489579.

The product of its digits is 90720, while the sum is 44.

The square root of 18979154 is about 4356.5070871054. The cubic root of 18979154 is about 266.7425405626.

The spelling of 18979154 in words is "eighteen million, nine hundred seventy-nine thousand, one hundred fifty-four".