189792257 has 4 divisors (see below), whose sum is σ = 189819840. Its totient is φ = 189764676.

The previous prime is 189792241. The next prime is 189792283. The reversal of 189792257 is 752297981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 189792257 - 2⁴ = 189792241 is a prime.

It is a super-2 number, since 2×189792257² = 72042201634308098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189792227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5948 + ... + 20370.

It is an arithmetic number, because the mean of its divisors is an integer number (47454960).

It is a Proth number, since it is equal to 181 ⋅ 2²⁰ + 1 and 181 < 2²⁰.

Almost surely, 2^189792257 is an apocalyptic number.

It is an amenable number.

189792257 is a deficient number, since it is larger than the sum of its proper divisors (27583).

189792257 is a wasteful number, since it uses less digits than its factorization.

189792257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27582.

The product of its digits is 635040, while the sum is 50.

The square root of 189792257 is about 13776.5110604971. The cubic root of 189792257 is about 574.6801063744.

The spelling of 189792257 in words is "one hundred eighty-nine million, seven hundred ninety-two thousand, two hundred fifty-seven".