1998190 has 8 divisors (see below), whose sum is σ = 3596760. Its totient is φ = 799272.

The previous prime is 1998181. The next prime is 1998209. The reversal of 1998190 is 918991.

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

It is a super-2 number, since 2×1998190² = 7985526552200, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99900 + ... + 99919.

It is an arithmetic number, because the mean of its divisors is an integer number (449595).

2^1998190 is an apocalyptic number.

1998190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998190 is a deficient number, since it is larger than the sum of its proper divisors (1598570).

1998190 is a wasteful number, since it uses less digits than its factorization.

1998190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199826.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 1998190 is about 1413.5734858860. The cubic root of 1998190 is about 125.9540858997.

The spelling of 1998190 in words is "one million, nine hundred ninety-eight thousand, one hundred ninety".