18489554 has 4 divisors (see below), whose sum is σ = 27734334. Its totient is φ = 9244776.

The previous prime is 18489553. The next prime is 18489571. The reversal of 18489554 is 45598481.

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

It can be written as a sum of positive squares in only one way, i.e., 11323225 + 7166329 = 3365^2 + 2677^2 .

It is not an unprimeable number, because it can be changed into a prime (18489553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4622387 + ... + 4622390.

Almost surely, 2^18489554 is an apocalyptic number.

18489554 is a deficient number, since it is larger than the sum of its proper divisors (9244780).

18489554 is an equidigital number, since it uses as much as digits as its factorization.

18489554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9244779.

The product of its digits is 230400, while the sum is 44.

The square root of 18489554 is about 4299.9481392221. The cubic root of 18489554 is about 264.4288350967.

The spelling of 18489554 in words is "eighteen million, four hundred eighty-nine thousand, five hundred fifty-four".