18278742 has 16 divisors (see below), whose sum is σ = 36599472. Its totient is φ = 6085920.

The previous prime is 18278717. The next prime is 18278753. The reversal of 18278742 is 24787281.

It is a super-2 number, since 2×18278742² = 668224818205128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18278742.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8892 + ... + 10752.

It is an arithmetic number, because the mean of its divisors is an integer number (2287467).

Almost surely, 2^18278742 is an apocalyptic number.

18278742 is an abundant number, since it is smaller than the sum of its proper divisors (18320730).

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

18278742 is a wasteful number, since it uses less digits than its factorization.

18278742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503.

The product of its digits is 50176, while the sum is 39.

The square root of 18278742 is about 4275.3645458604. The cubic root of 18278742 is about 263.4200134808.

The spelling of 18278742 in words is "eighteen million, two hundred seventy-eight thousand, seven hundred forty-two".