189898121 has 16 divisors (see below), whose sum is σ = 219691008. Its totient is φ = 160785600.

The previous prime is 189898073. The next prime is 189898123. The reversal of 189898121 is 121898981.

189898121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 189898121 - 2²⁶ = 122789257 is a prime.

It is a super-2 number, since 2×189898121² = 72122592718661282, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189898123) 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, 230891 + ... + 231711.

It is an arithmetic number, because the mean of its divisors is an integer number (13730688).

Almost surely, 2^189898121 is an apocalyptic number.

It is an amenable number.

189898121 is a deficient number, since it is larger than the sum of its proper divisors (29792887).

189898121 is a wasteful number, since it uses less digits than its factorization.

189898121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192.

The product of its digits is 82944, while the sum is 47.

The square root of 189898121 is about 13780.3527168211. The cubic root of 189898121 is about 574.7869365611.

The spelling of 189898121 in words is "one hundred eighty-nine million, eight hundred ninety-eight thousand, one hundred twenty-one".