188384813 has 4 divisors (see below), whose sum is σ = 188412288. Its totient is φ = 188357340.

The previous prime is 188384761. The next prime is 188384821. The reversal of 188384813 is 318483881.

188384813 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 a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 188384813 - 2⁸ = 188384557 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 (188384863) 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, 6020 + ... + 20322.

It is an arithmetic number, because the mean of its divisors is an integer number (47103072).

Almost surely, 2^188384813 is an apocalyptic number.

188384813 is the 7337-th centered heptagonal number.

It is an amenable number.

188384813 is a deficient number, since it is larger than the sum of its proper divisors (27475).

188384813 is a wasteful number, since it uses less digits than its factorization.

188384813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27474.

The product of its digits is 147456, while the sum is 44.

The square root of 188384813 is about 13725.3347135871. The cubic root of 188384813 is about 573.2560270369.

The spelling of 188384813 in words is "one hundred eighty-eight million, three hundred eighty-four thousand, eight hundred thirteen".