187985401 has 2 divisors, whose sum is σ = 187985402. Its totient is φ = 187985400.

The previous prime is 187985381. The next prime is 187985423. The reversal of 187985401 is 104589781.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183575401 + 4410000 = 13549^2 + 2100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187985401 is a prime.

It is not a weakly prime, because it can be changed into another prime (187985431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93992700 + 93992701.

It is an arithmetic number, because the mean of its divisors is an integer number (93992701).

Almost surely, 2^187985401 is an apocalyptic number.

It is an amenable number.

187985401 is a deficient number, since it is larger than the sum of its proper divisors (1).

187985401 is an equidigital number, since it uses as much as digits as its factorization.

187985401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 187985401 is about 13710.7768197138. The cubic root of 187985401 is about 572.8506027349.

The spelling of 187985401 in words is "one hundred eighty-seven million, nine hundred eighty-five thousand, four hundred one".