1998375 has 24 divisors (see below), whose sum is σ = 3371472. Its totient is φ = 1051200.

The previous prime is 1998371. The next prime is 1998379. The reversal of 1998375 is 5738991.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1998371) and next prime (1998379).

It is not a de Polignac number, because 1998375 - 2² = 1998371 is a prime.

Its product of digits (68040) is a multiple of the sum of its prime divisors (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27339 + ... + 27411.

It is an arithmetic number, because the mean of its divisors is an integer number (140478).

2^1998375 is an apocalyptic number.

1998375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1998375 is a deficient number, since it is larger than the sum of its proper divisors (1373097).

1998375 is an frugal number, since it uses more digits than its factorization.

1998375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 81 counting only the distinct ones).

The product of its digits is 68040, while the sum is 42.

The square root of 1998375 is about 1413.6389213657. The cubic root of 1998375 is about 125.9579728819.

The spelling of 1998375 in words is "one million, nine hundred ninety-eight thousand, three hundred seventy-five".