18719898 has 16 divisors (see below), whose sum is σ = 37671456. Its totient is φ = 6201360.

The previous prime is 18719893. The next prime is 18719917. The reversal of 18719898 is 89891781.

It is a super-2 number, since 2×18719898² = 700869162260808, 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 18719898.

It is not an unprimeable number, because it can be changed into a prime (18719893) 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, 8593 + ... + 10548.

It is an arithmetic number, because the mean of its divisors is an integer number (2354466).

Almost surely, 2^18719898 is an apocalyptic number.

18719898 is an abundant number, since it is smaller than the sum of its proper divisors (18951558).

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

18719898 is a wasteful number, since it uses less digits than its factorization.

18719898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19309.

The product of its digits is 290304, while the sum is 51.

The square root of 18719898 is about 4326.6497431616. The cubic root of 18719898 is about 265.5223965984.

The spelling of 18719898 in words is "eighteen million, seven hundred nineteen thousand, eight hundred ninety-eight".