189422781 has 8 divisors (see below), whose sum is σ = 252808224. Its totient is φ = 126159600.

The previous prime is 189422759. The next prime is 189422797. The reversal of 189422781 is 187224981.

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

It is not a de Polignac number, because 189422781 - 2⁵ = 189422749 is a prime.

It is a super-2 number, since 2×189422781² = 71761979923547922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189422711) 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, 26886 + ... + 33191.

It is an arithmetic number, because the mean of its divisors is an integer number (31601028).

Almost surely, 2^189422781 is an apocalyptic number.

It is an amenable number.

189422781 is a deficient number, since it is larger than the sum of its proper divisors (63385443).

189422781 is a wasteful number, since it uses less digits than its factorization.

189422781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61131.

The product of its digits is 64512, while the sum is 42.

The square root of 189422781 is about 13763.0948917749. The cubic root of 189422781 is about 574.3069467181.

The spelling of 189422781 in words is "one hundred eighty-nine million, four hundred twenty-two thousand, seven hundred eighty-one".