1998403172 has 12 divisors (see below), whose sum is σ = 3498665856. Its totient is φ = 998784360.

The previous prime is 1998403153. The next prime is 1998403207. The reversal of 1998403172 is 2713048991.

It is a super-3 number, since 3×1998403172³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93404 + ... + 112787.

It is an arithmetic number, because the mean of its divisors is an integer number (291555488).

Almost surely, 2^1998403172 is an apocalyptic number.

It is an amenable number.

1998403172 is a deficient number, since it is larger than the sum of its proper divisors (1500262684).

1998403172 is a wasteful number, since it uses less digits than its factorization.

1998403172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208618 (or 208616 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1998403172 is about 44703.5029052534. The cubic root of 1998403172 is about 1259.5856477474.

The spelling of 1998403172 in words is "one billion, nine hundred ninety-eight million, four hundred three thousand, one hundred seventy-two".