189897967 has 16 divisors (see below), whose sum is σ = 220852800. Its totient is φ = 159925248.

The previous prime is 189897919. The next prime is 189897977. The reversal of 189897967 is 769798981.

It is not a de Polignac number, because 189897967 - 2⁷ = 189897839 is a prime.

It is a super-2 number, since 2×189897967² = 72122475741466178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 189897899 and 189897908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189897977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100233 + ... + 102109.

It is an arithmetic number, because the mean of its divisors is an integer number (13803300).

Almost surely, 2^189897967 is an apocalyptic number.

189897967 is a deficient number, since it is larger than the sum of its proper divisors (30954833).

189897967 is a wasteful number, since it uses less digits than its factorization.

189897967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130.

The product of its digits is 13716864, while the sum is 64.

The square root of 189897967 is about 13780.3471291546. The cubic root of 189897967 is about 574.7867811844.

The spelling of 189897967 in words is "one hundred eighty-nine million, eight hundred ninety-seven thousand, nine hundred sixty-seven".