189977157 has 12 divisors (see below), whose sum is σ = 284575200. Its totient is φ = 126651276.

The previous prime is 189977153. The next prime is 189977191. The reversal of 189977157 is 751779981.

It is not a de Polignac number, because 189977157 - 2² = 189977153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189977153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 390657 + ... + 391142.

It is an arithmetic number, because the mean of its divisors is an integer number (23714600).

Almost surely, 2^189977157 is an apocalyptic number.

It is an amenable number.

189977157 is a deficient number, since it is larger than the sum of its proper divisors (94598043).

189977157 is an frugal number, since it uses more digits than its factorization.

189977157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781814 (or 781802 counting only the distinct ones).

The product of its digits is 1111320, while the sum is 54.

The square root of 189977157 is about 13783.2201244847. The cubic root of 189977157 is about 574.8666680139.

The spelling of 189977157 in words is "one hundred eighty-nine million, nine hundred seventy-seven thousand, one hundred fifty-seven".