1998425 has 36 divisors (see below), whose sum is σ = 2995344. Its totient is φ = 1310400.

The previous prime is 1998413. The next prime is 1998427. The reversal of 1998425 is 5248991.

It is not a de Polignac number, because 1998425 - 2⁸ = 1998169 is a prime.

Its product of digits (25920) is a multiple of the sum of its prime divisors (72).

It is not an unprimeable number, because it can be changed into a prime (1998427) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 46454 + ... + 46496.

It is an arithmetic number, because the mean of its divisors is an integer number (83204).

2^1998425 is an apocalyptic number.

It is an amenable number.

1998425 is a deficient number, since it is larger than the sum of its proper divisors (996919).

1998425 is a wasteful number, since it uses less digits than its factorization.

1998425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 72 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 1998425 is about 1413.6566061106. The cubic root of 1998425 is about 125.9590233765.

The spelling of 1998425 in words is "one million, nine hundred ninety-eight thousand, four hundred twenty-five".