189955 has 4 divisors (see below), whose sum is σ = 227952. Its totient is φ = 151960.

The previous prime is 189949. The next prime is 189961. The reversal of 189955 is 559981.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (189949) and next prime (189961).

It is not a de Polignac number, because 189955 - 2³ = 189947 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18991 + ... + 19000.

It is an arithmetic number, because the mean of its divisors is an integer number (56988).

2¹⁸⁹⁹⁵⁵ is an apocalyptic number.

189955 is a deficient number, since it is larger than the sum of its proper divisors (37997).

189955 is an equidigital number, since it uses as much as digits as its factorization.

189955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37996.

The product of its digits is 16200, while the sum is 37.

The square root of 189955 is about 435.8382727572. The cubic root of 189955 is about 57.4844318281.

Subtracting from 189955 its product of digits (16200), we obtain a triangular number (173755 = T₅₈₉).

The spelling of 189955 in words is "one hundred eighty-nine thousand, nine hundred fifty-five".