188783989 has 4 divisors (see below), whose sum is σ = 188942380. Its totient is φ = 188625600.

The previous prime is 188783971. The next prime is 188783993. The reversal of 188783989 is 989387881.

188783989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989387881 = 37 ⋅26740213.

It can be written as a sum of positive squares in 2 ways, for example, as 31080625 + 157703364 = 5575^2 + 12558^2 .

It is a cyclic number.

It is not a de Polignac number, because 188783989 - 2²⁷ = 54566261 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 (188783999) 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, 77394 + ... + 79795.

It is an arithmetic number, because the mean of its divisors is an integer number (47235595).

Almost surely, 2^188783989 is an apocalyptic number.

It is an amenable number.

188783989 is a deficient number, since it is larger than the sum of its proper divisors (158391).

188783989 is a wasteful number, since it uses less digits than its factorization.

188783989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158390.

The product of its digits is 6967296, while the sum is 61.

The square root of 188783989 is about 13739.8685947137. The cubic root of 188783989 is about 573.6606396462.

The spelling of 188783989 in words is "one hundred eighty-eight million, seven hundred eighty-three thousand, nine hundred eighty-nine".