188400427 has 2 divisors, whose sum is σ = 188400428. Its totient is φ = 188400426.

The previous prime is 188400419. The next prime is 188400431. The reversal of 188400427 is 724004881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 188400427 - 2³ = 188400419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 188400392 and 188400401.

It is not a weakly prime, because it can be changed into another prime (188400437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94200213 + 94200214.

It is an arithmetic number, because the mean of its divisors is an integer number (94200214).

Almost surely, 2^188400427 is an apocalyptic number.

188400427 is a deficient number, since it is larger than the sum of its proper divisors (1).

188400427 is an equidigital number, since it uses as much as digits as its factorization.

188400427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 188400427 is about 13725.9035039592. The cubic root of 188400427 is about 573.2718644288.

The spelling of 188400427 in words is "one hundred eighty-eight million, four hundred thousand, four hundred twenty-seven".