189908893 has 4 divisors (see below), whose sum is σ = 191046240. Its totient is φ = 188771548.

The previous prime is 189908891. The next prime is 189908899. The reversal of 189908893 is 398809981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 189908893 - 2¹ = 189908891 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189908891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568423 + ... + 568756.

It is an arithmetic number, because the mean of its divisors is an integer number (47761560).

Almost surely, 2^189908893 is an apocalyptic number.

It is an amenable number.

189908893 is a deficient number, since it is larger than the sum of its proper divisors (1137347).

189908893 is a wasteful number, since it uses less digits than its factorization.

189908893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137346.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 189908893 is about 13780.7435575879. The cubic root of 189908893 is about 574.7978046479.

The spelling of 189908893 in words is "one hundred eighty-nine million, nine hundred eight thousand, eight hundred ninety-three".