126640399 has 2 divisors, whose sum is σ = 126640400. Its totient is φ = 126640398.

The previous prime is 126640337. The next prime is 126640403. The reversal of 126640399 is 993046621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126640399 - 2⁷ = 126640271 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 (126640309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63320199 + 63320200.

It is an arithmetic number, because the mean of its divisors is an integer number (63320200).

Almost surely, 2^126640399 is an apocalyptic number.

126640399 is a deficient number, since it is larger than the sum of its proper divisors (1).

126640399 is an equidigital number, since it uses as much as digits as its factorization.

126640399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 126640399 is about 11253.4616452006. The cubic root of 126640399 is about 502.1777001409.

The spelling of 126640399 in words is "one hundred twenty-six million, six hundred forty thousand, three hundred ninety-nine".