18380498 has 4 divisors (see below), whose sum is σ = 27570750. Its totient is φ = 9190248.

The previous prime is 18380497. The next prime is 18380539. The reversal of 18380498 is 89408381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89408381 = 127 ⋅704003.

It can be written as a sum of positive squares in only one way, i.e., 14190289 + 4190209 = 3767^2 + 2047^2 .

It is not an unprimeable number, because it can be changed into a prime (18380497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4595123 + ... + 4595126.

Almost surely, 2^18380498 is an apocalyptic number.

18380498 is a deficient number, since it is larger than the sum of its proper divisors (9190252).

18380498 is an equidigital number, since it uses as much as digits as its factorization.

18380498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9190251.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 18380498 is about 4287.2483016499. The cubic root of 18380498 is about 263.9079205201.

The spelling of 18380498 in words is "eighteen million, three hundred eighty thousand, four hundred ninety-eight".