188974421 has 4 divisors (see below), whose sum is σ = 189031500. Its totient is φ = 188917344.

The previous prime is 188974403. The next prime is 188974427. The reversal of 188974421 is 124479881.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7102225 + 181872196 = 2665^2 + 13486^2 .

It is a cyclic number.

It is not a de Polignac number, because 188974421 - 2²² = 184780117 is a prime.

It is a super-2 number, since 2×188974421² = 71422663584570482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188974427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23246 + ... + 30303.

It is an arithmetic number, because the mean of its divisors is an integer number (47257875).

Almost surely, 2^188974421 is an apocalyptic number.

It is an amenable number.

188974421 is a deficient number, since it is larger than the sum of its proper divisors (57079).

188974421 is an equidigital number, since it uses as much as digits as its factorization.

188974421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57078.

The product of its digits is 129024, while the sum is 44.

The square root of 188974421 is about 13746.7967541533. The cubic root of 188974421 is about 573.8534643162.

The spelling of 188974421 in words is "one hundred eighty-eight million, nine hundred seventy-four thousand, four hundred twenty-one".