126409999 has 2 divisors, whose sum is σ = 126410000. Its totient is φ = 126409998.

The previous prime is 126409967. The next prime is 126410017. The reversal of 126409999 is 999904621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126409999 - 2⁵ = 126409967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126409949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63204999 + 63205000.

It is an arithmetic number, because the mean of its divisors is an integer number (63205000).

Almost surely, 2^126409999 is an apocalyptic number.

126409999 is a deficient number, since it is larger than the sum of its proper divisors (1).

126409999 is an equidigital number, since it uses as much as digits as its factorization.

126409999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 126409999 is about 11243.2201348190. The cubic root of 126409999 is about 501.8729738440.

The spelling of 126409999 in words is "one hundred twenty-six million, four hundred nine thousand, nine hundred ninety-nine".