189442990 has 16 divisors (see below), whose sum is σ = 371997360. Its totient is φ = 68888320.

The previous prime is 189442931. The next prime is 189442991. The reversal of 189442990 is 99244981.

It is a self number, because there is not a number n which added to its sum of digits gives 189442990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189442991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860995 + ... + 861214.

It is an arithmetic number, because the mean of its divisors is an integer number (23249835).

Almost surely, 2^189442990 is an apocalyptic number.

189442990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189442990 is a deficient number, since it is larger than the sum of its proper divisors (182554370).

189442990 is a wasteful number, since it uses less digits than its factorization.

189442990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722227.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 189442990 is about 13763.8290457271. The cubic root of 189442990 is about 574.3273697392.

The spelling of 189442990 in words is "one hundred eighty-nine million, four hundred forty-two thousand, nine hundred ninety".