188142397 has 4 divisors (see below), whose sum is σ = 188577340. Its totient is φ = 187707456.

The previous prime is 188142377. The next prime is 188142407. The reversal of 188142397 is 793241881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 793241881 = 15013 ⋅52837.

It can be written as a sum of positive squares in 2 ways, for example, as 100420441 + 87721956 = 10021^2 + 9366^2 .

It is a cyclic number.

It is not a de Polignac number, because 188142397 - 2¹⁵ = 188109629 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 (188142307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216822 + ... + 217687.

It is an arithmetic number, because the mean of its divisors is an integer number (47144335).

Almost surely, 2^188142397 is an apocalyptic number.

It is an amenable number.

188142397 is a deficient number, since it is larger than the sum of its proper divisors (434943).

188142397 is an equidigital number, since it uses as much as digits as its factorization.

188142397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434942.

The product of its digits is 96768, while the sum is 43.

The square root of 188142397 is about 13716.5009021981. The cubic root of 188142397 is about 573.0100304137.

The spelling of 188142397 in words is "one hundred eighty-eight million, one hundred forty-two thousand, three hundred ninety-seven".