189442981 has 32 divisors (see below), whose sum is σ = 239500800. Its totient is φ = 145877760.

The previous prime is 189442931. The next prime is 189442991. The reversal of 189442981 is 189244981.

It is not a de Polignac number, because 189442981 - 2¹³ = 189434789 is a prime.

It is a super-2 number, since 2×189442981² = 71777286100332722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189442931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 704115 + ... + 704383.

It is an arithmetic number, because the mean of its divisors is an integer number (7484400).

Almost surely, 2^189442981 is an apocalyptic number.

It is an amenable number.

189442981 is a deficient number, since it is larger than the sum of its proper divisors (50057819).

189442981 is a wasteful number, since it uses less digits than its factorization.

189442981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469.

The product of its digits is 165888, while the sum is 46.

The square root of 189442981 is about 13763.8287187832. The cubic root of 189442981 is about 574.3273606442.

The spelling of 189442981 in words is "one hundred eighty-nine million, four hundred forty-two thousand, nine hundred eighty-one".