188400799 has 2 divisors, whose sum is σ = 188400800. Its totient is φ = 188400798.

The previous prime is 188400763. The next prime is 188400803. The reversal of 188400799 is 997004881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 188400799 - 2¹¹ = 188398751 is a prime.

It is a super-2 number, since 2×188400799² = 70989722127676802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188401799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94200399 + 94200400.

It is an arithmetic number, because the mean of its divisors is an integer number (94200400).

Almost surely, 2^188400799 is an apocalyptic number.

188400799 is a deficient number, since it is larger than the sum of its proper divisors (1).

188400799 is an equidigital number, since it uses as much as digits as its factorization.

188400799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 188400799 is about 13725.9170549730. The cubic root of 188400799 is about 573.2722417404.

The spelling of 188400799 in words is "one hundred eighty-eight million, four hundred thousand, seven hundred ninety-nine".