189024921 has 20 divisors (see below), whose sum is σ = 298982772. Its totient is φ = 118603008.

The previous prime is 189024911. The next prime is 189024923. The reversal of 189024921 is 129420981.

It can be written as a sum of positive squares in 2 ways, for example, as 165405321 + 23619600 = 12861^2 + 4860^2 .

It is not a de Polignac number, because 189024921 - 2¹⁴ = 189008537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (189024923) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 67260 + ... + 70013.

Almost surely, 2^189024921 is an apocalyptic number.

It is an amenable number.

189024921 is a deficient number, since it is larger than the sum of its proper divisors (109957851).

189024921 is a wasteful number, since it uses less digits than its factorization.

189024921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137302 (or 137293 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 189024921 is about 13748.6334229988. The cubic root of 189024921 is about 573.9045770872.

The spelling of 189024921 in words is "one hundred eighty-nine million, twenty-four thousand, nine hundred twenty-one".