18861798 has 16 divisors (see below), whose sum is σ = 37783296. Its totient is φ = 6277320.

The previous prime is 18861797. The next prime is 18861809. The reversal of 18861798 is 89716881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18861793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2343 + ... + 6573.

It is an arithmetic number, because the mean of its divisors is an integer number (2361456).

Almost surely, 2^18861798 is an apocalyptic number.

18861798 is an abundant number, since it is smaller than the sum of its proper divisors (18921498).

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

18861798 is a wasteful number, since it uses less digits than its factorization.

18861798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4979.

The product of its digits is 193536, while the sum is 48.

The square root of 18861798 is about 4343.0171540071. The cubic root of 18861798 is about 266.1916101101.

The spelling of 18861798 in words is "eighteen million, eight hundred sixty-one thousand, seven hundred ninety-eight".