19998125 has 30 divisors (see below), whose sum is σ = 29114118. Its totient is φ = 13692000.

The previous prime is 19998047. The next prime is 19998149. The reversal of 19998125 is 52189991.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 10640644 + 9357481 = 3262^2 + 3059^2 .

It is not a de Polignac number, because 19998125 - 2⁸ = 19997869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 30299 + ... + 30951.

Almost surely, 2^19998125 is an apocalyptic number.

It is an amenable number.

19998125 is a deficient number, since it is larger than the sum of its proper divisors (9115993).

19998125 is an frugal number, since it uses more digits than its factorization.

19998125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687 (or 665 counting only the distinct ones).

The product of its digits is 58320, while the sum is 44.

The square root of 19998125 is about 4471.9263187132. The cubic root of 19998125 is about 271.4332788393.

The spelling of 19998125 in words is "nineteen million, nine hundred ninety-eight thousand, one hundred twenty-five".