18798642 has 20 divisors (see below), whose sum is σ = 42123246. Its totient is φ = 6266160.

The previous prime is 18798629. The next prime is 18798649. The reversal of 18798642 is 24689781.

It can be written as a sum of positive squares in only one way, i.e., 10556001 + 8242641 = 3249^2 + 2871^2 .

It is not an unprimeable number, because it can be changed into a prime (18798649) 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, 57859 + ... + 58182.

Almost surely, 2^18798642 is an apocalyptic number.

18798642 is an abundant number, since it is smaller than the sum of its proper divisors (23324604).

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

18798642 is a wasteful number, since it uses less digits than its factorization.

18798642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116055 (or 116046 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 18798642 is about 4335.7400752351. The cubic root of 18798642 is about 265.8941765348.

The spelling of 18798642 in words is "eighteen million, seven hundred ninety-eight thousand, six hundred forty-two".