1998725 has 12 divisors (see below), whose sum is σ = 2559360. Its totient is φ = 1546800.

The previous prime is 1998701. The next prime is 1998727. The reversal of 1998725 is 5278991.

It is not a de Polignac number, because 1998725 - 2¹⁰ = 1997701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 515 + ... + 2064.

It is an arithmetic number, because the mean of its divisors is an integer number (213280).

2^1998725 is an apocalyptic number.

It is an amenable number.

1998725 is a deficient number, since it is larger than the sum of its proper divisors (560635).

1998725 is a wasteful number, since it uses less digits than its factorization.

1998725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620 (or 2615 counting only the distinct ones).

The product of its digits is 45360, while the sum is 41.

The square root of 1998725 is about 1413.7627099340. The cubic root of 1998725 is about 125.9653259758.

The spelling of 1998725 in words is "one million, nine hundred ninety-eight thousand, seven hundred twenty-five".