188400761 has 2 divisors, whose sum is σ = 188400762. Its totient is φ = 188400760.

The previous prime is 188400727. The next prime is 188400763. The reversal of 188400761 is 167004881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138203536 + 50197225 = 11756^2 + 7085^2 .

It is a cyclic number.

It is not a de Polignac number, because 188400761 - 2²² = 184206457 is a prime.

Together with 188400763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188400763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94200380 + 94200381.

It is an arithmetic number, because the mean of its divisors is an integer number (94200381).

Almost surely, 2^188400761 is an apocalyptic number.

It is an amenable number.

188400761 is a deficient number, since it is larger than the sum of its proper divisors (1).

188400761 is an equidigital number, since it uses as much as digits as its factorization.

188400761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 188400761 is about 13725.9156707303. The cubic root of 188400761 is about 573.2722031979.

The spelling of 188400761 in words is "one hundred eighty-eight million, four hundred thousand, seven hundred sixty-one".