18213498 has 20 divisors (see below), whose sum is σ = 40812090. Its totient is φ = 6071112.

The previous prime is 18213497. The next prime is 18213499. The reversal of 18213498 is 89431281.

It is an interprime number because it is at equal distance from previous prime (18213497) and next prime (18213499).

It can be written as a sum of positive squares in only one way, i.e., 13816089 + 4397409 = 3717^2 + 2097^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18213497) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 56053 + ... + 56376.

Almost surely, 2^18213498 is an apocalyptic number.

18213498 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18213498 is an abundant number, since it is smaller than the sum of its proper divisors (22598592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18213498 is a wasteful number, since it uses less digits than its factorization.

18213498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112443 (or 112434 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18213498 is about 4267.7274983298. The cubic root of 18213498 is about 263.1062233862.

The spelling of 18213498 in words is "eighteen million, two hundred thirteen thousand, four hundred ninety-eight".