19897898 has 16 divisors (see below), whose sum is σ = 31268160. Its totient is φ = 9478656.

The previous prime is 19897859. The next prime is 19897903. The reversal of 19897898 is 89879891.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13418 + ... + 14826.

It is an arithmetic number, because the mean of its divisors is an integer number (1954260).

Almost surely, 2^19897898 is an apocalyptic number.

19897898 is a deficient number, since it is larger than the sum of its proper divisors (11370262).

19897898 is a wasteful number, since it uses less digits than its factorization.

19897898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741.

The product of its digits is 2612736, while the sum is 59.

The square root of 19897898 is about 4460.7059979335. The cubic root of 19897898 is about 270.9790609403.

The spelling of 19897898 in words is "nineteen million, eight hundred ninety-seven thousand, eight hundred ninety-eight".