189074781 has 18 divisors (see below), whose sum is σ = 317697822. Its totient is φ = 108042480.

The previous prime is 189074761. The next prime is 189074839. The reversal of 189074781 is 187470981.

189074781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 186322500 + 2752281 = 13650^2 + 1659^2 .

It is not a de Polignac number, because 189074781 - 2⁷ = 189074653 is a prime.

It is a super-2 number, since 2×189074781² = 71498545620395922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189074761) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 213930 + ... + 214811.

It is an arithmetic number, because the mean of its divisors is an integer number (17649879).

Almost surely, 2^189074781 is an apocalyptic number.

It is an amenable number.

189074781 is a deficient number, since it is larger than the sum of its proper divisors (128623041).

189074781 is a wasteful number, since it uses less digits than its factorization.

189074781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428761 (or 428751 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 189074781 is about 13750.4465745662. The cubic root of 189074781 is about 573.9550331619.

The spelling of 189074781 in words is "one hundred eighty-nine million, seventy-four thousand, seven hundred eighty-one".