18374489 has 4 divisors (see below), whose sum is σ = 20999424. Its totient is φ = 15749556.

The previous prime is 18374483. The next prime is 18374491. The reversal of 18374489 is 98447381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98447381 = 2621 ⋅37561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18374489 is a prime.

It is a super-2 number, since 2×18374489² = 675243692022242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18374483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1312457 + ... + 1312470.

It is an arithmetic number, because the mean of its divisors is an integer number (5249856).

Almost surely, 2^18374489 is an apocalyptic number.

It is an amenable number.

18374489 is a deficient number, since it is larger than the sum of its proper divisors (2624935).

18374489 is an equidigital number, since it uses as much as digits as its factorization.

18374489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624934.

The product of its digits is 193536, while the sum is 44.

The square root of 18374489 is about 4286.5474452058. The cubic root of 18374489 is about 263.8791582319.

The spelling of 18374489 in words is "eighteen million, three hundred seventy-four thousand, four hundred eighty-nine".