189493993990 has 32 divisors (see below), whose sum is σ = 396423279360. Its totient is φ = 63868192224.

The previous prime is 189493993961. The next prime is 189493994021. The reversal of 189493993990 is 99399394981.

It is a super-2 number, since 2×189493993990² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 22937032 + ... + 22945291.

It is an arithmetic number, because the mean of its divisors is an integer number (12388227480).

Almost surely, 2^189493993990 is an apocalyptic number.

189493993990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189493993990 is an abundant number, since it is smaller than the sum of its proper divisors (206929285370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189493993990 is a wasteful number, since it uses less digits than its factorization.

189493993990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45882396.

The product of its (nonzero) digits is 153055008, while the sum is 73.

The spelling of 189493993990 in words is "one hundred eighty-nine billion, four hundred ninety-three million, nine hundred ninety-three thousand, nine hundred ninety".