189971957 has 16 divisors (see below), whose sum is σ = 230735232. Its totient is φ = 152686080.

The previous prime is 189971933. The next prime is 189971959. The reversal of 189971957 is 759179981.

It is a cyclic number.

It is not a de Polignac number, because 189971957 - 2¹⁰ = 189970933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189971959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30857 + ... + 36497.

It is an arithmetic number, because the mean of its divisors is an integer number (14420952).

Almost surely, 2^189971957 is an apocalyptic number.

189971957 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

189971957 is a deficient number, since it is larger than the sum of its proper divisors (40763275).

189971957 is a wasteful number, since it uses less digits than its factorization.

189971957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5948.

The product of its digits is 1428840, while the sum is 56.

The square root of 189971957 is about 13783.0314880290. The cubic root of 189971957 is about 574.8614229378.

The spelling of 189971957 in words is "one hundred eighty-nine million, nine hundred seventy-one thousand, nine hundred fifty-seven".