18987282 has 24 divisors (see below), whose sum is σ = 42928704. Its totient is φ = 6053784.

The previous prime is 18987263. The next prime is 18987299. The reversal of 18987282 is 28278981.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22518 + ... + 23345.

It is an arithmetic number, because the mean of its divisors is an integer number (1788696).

Almost surely, 2^18987282 is an apocalyptic number.

18987282 is an abundant number, since it is smaller than the sum of its proper divisors (23941422).

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

18987282 is a wasteful number, since it uses less digits than its factorization.

18987282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45894 (or 45891 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 18987282 is about 4357.4398446794. The cubic root of 18987282 is about 266.7806134563.

It can be divided in two parts, 1898 and 7282, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 18987282 in words is "eighteen million, nine hundred eighty-seven thousand, two hundred eighty-two".