189610749 has 12 divisors (see below), whose sum is σ = 274085500. Its totient is φ = 126313344.

The previous prime is 189610739. The next prime is 189610763. The reversal of 189610749 is 947016981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 116251524 + 73359225 = 10782^2 + 8565^2 .

It is not a de Polignac number, because 189610749 - 2⁵ = 189610717 is a prime.

It is a super-2 number, since 2×189610749² = 71904472272682002, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189610739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6327 + ... + 20475.

Almost surely, 2^189610749 is an apocalyptic number.

It is an amenable number.

189610749 is a deficient number, since it is larger than the sum of its proper divisors (84474751).

189610749 is a wasteful number, since it uses less digits than its factorization.

189610749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15644 (or 15641 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 189610749 is about 13769.9218952033. The cubic root of 189610749 is about 574.4968493261.

The spelling of 189610749 in words is "one hundred eighty-nine million, six hundred ten thousand, seven hundred forty-nine".