188920393 has 4 divisors (see below), whose sum is σ = 188999440. Its totient is φ = 188841348.

The previous prime is 188920387. The next prime is 188920411. The reversal of 188920393 is 393029881.

It is a happy number.

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 188920393 - 2²⁵ = 155365961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188920373) 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, 35823 + ... + 40756.

It is an arithmetic number, because the mean of its divisors is an integer number (47249860).

Almost surely, 2^188920393 is an apocalyptic number.

It is an amenable number.

188920393 is a deficient number, since it is larger than the sum of its proper divisors (79047).

188920393 is an equidigital number, since it uses as much as digits as its factorization.

188920393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79046.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 188920393 is about 13744.8315013317. The cubic root of 188920393 is about 573.7987706528.

The spelling of 188920393 in words is "one hundred eighty-eight million, nine hundred twenty thousand, three hundred ninety-three".