189928493 has 4 divisors (see below), whose sum is σ = 193147680. Its totient is φ = 186709308.

The previous prime is 189928483. The next prime is 189928499. The reversal of 189928493 is 394829981.

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 189928493 - 2⁶ = 189928429 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 (189928499) 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, 1609505 + ... + 1609622.

It is an arithmetic number, because the mean of its divisors is an integer number (48286920).

Almost surely, 2^189928493 is an apocalyptic number.

It is an amenable number.

189928493 is a deficient number, since it is larger than the sum of its proper divisors (3219187).

189928493 is an equidigital number, since it uses as much as digits as its factorization.

189928493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3219186.

The product of its digits is 1119744, while the sum is 53.

The square root of 189928493 is about 13781.4546764846. The cubic root of 189928493 is about 574.8175784269.

The spelling of 189928493 in words is "one hundred eighty-nine million, nine hundred twenty-eight thousand, four hundred ninety-three".