126399997 has 4 divisors (see below), whose sum is σ = 127559740. Its totient is φ = 125240256.

The previous prime is 126399979. The next prime is 126400013. The reversal of 126399997 is 799993621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58155876 + 68244121 = 7626^2 + 8261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126399997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126399397) 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 in 3 ways as a sum of consecutive naturals, for example, 579708 + ... + 579925.

It is an arithmetic number, because the mean of its divisors is an integer number (31889935).

Almost surely, 2^126399997 is an apocalyptic number.

It is an amenable number.

126399997 is a deficient number, since it is larger than the sum of its proper divisors (1159743).

126399997 is a wasteful number, since it uses less digits than its factorization.

126399997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159742.

The product of its digits is 1653372, while the sum is 55.

The square root of 126399997 is about 11242.7753246251. The cubic root of 126399997 is about 501.8597368482.

The spelling of 126399997 in words is "one hundred twenty-six million, three hundred ninety-nine thousand, nine hundred ninety-seven".