1989425 has 24 divisors (see below), whose sum is σ = 2714112. Its totient is φ = 1440000.

The previous prime is 1989419. The next prime is 1989479. The reversal of 1989425 is 5249891.

It is a de Polignac number, because none of the positive numbers 2^k-1989425 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13100 + ... + 13250.

It is an arithmetic number, because the mean of its divisors is an integer number (113088).

2^1989425 is an apocalyptic number.

It is an amenable number.

1989425 is a deficient number, since it is larger than the sum of its proper divisors (724687).

1989425 is a wasteful number, since it uses less digits than its factorization.

1989425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 204 counting only the distinct ones).

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

The square root of 1989425 is about 1410.4697798960. The cubic root of 1989425 is about 125.7696513680.

The spelling of 1989425 in words is "one million, nine hundred eighty-nine thousand, four hundred twenty-five".