186406949 has 2 divisors, whose sum is σ = 186406950. Its totient is φ = 186406948.

The previous prime is 186406919. The next prime is 186406991. The reversal of 186406949 is 949604681.

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., 172396900 + 14010049 = 13130^2 + 3743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-186406949 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (186406919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93203474 + 93203475.

It is an arithmetic number, because the mean of its divisors is an integer number (93203475).

Almost surely, 2^186406949 is an apocalyptic number.

It is an amenable number.

186406949 is a deficient number, since it is larger than the sum of its proper divisors (1).

186406949 is an equidigital number, since it uses as much as digits as its factorization.

186406949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 186406949 is about 13653.0930195322. The cubic root of 186406949 is about 571.2427476348.

The spelling of 186406949 in words is "one hundred eighty-six million, four hundred six thousand, nine hundred forty-nine".