19198985 has 16 divisors (see below), whose sum is σ = 25283664. Its totient is φ = 13907712.

The previous prime is 19198969. The next prime is 19199023. The reversal of 19198985 is 58989191.

It can be written as a sum of positive squares in 8 ways, for example, as 3485689 + 15713296 = 1867^2 + 3964^2 .

It is not a de Polignac number, because 19198985 - 2⁴ = 19198969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 659 + ... + 6231.

It is an arithmetic number, because the mean of its divisors is an integer number (1580229).

Almost surely, 2^19198985 is an apocalyptic number.

It is an amenable number.

19198985 is a deficient number, since it is larger than the sum of its proper divisors (6084679).

19198985 is a wasteful number, since it uses less digits than its factorization.

19198985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5644.

The product of its digits is 233280, while the sum is 50.

The square root of 19198985 is about 4381.6646380114. The cubic root of 19198985 is about 267.7684613772.

The spelling of 19198985 in words is "nineteen million, one hundred ninety-eight thousand, nine hundred eighty-five".