1985398 has 8 divisors (see below), whose sum is σ = 3080880. Its totient is φ = 958440.

The previous prime is 1985377. The next prime is 1985407. The reversal of 1985398 is 8935891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17058 + ... + 17173.

It is an arithmetic number, because the mean of its divisors is an integer number (385110).

2^1985398 is an apocalyptic number.

1985398 is a deficient number, since it is larger than the sum of its proper divisors (1095482).

1985398 is a wasteful number, since it uses less digits than its factorization.

1985398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34262.

The product of its digits is 77760, while the sum is 43.

The square root of 1985398 is about 1409.0415181960. The cubic root of 1985398 is about 125.6847329441.

The spelling of 1985398 in words is "one million, nine hundred eighty-five thousand, three hundred ninety-eight".