126699899 has 4 divisors (see below), whose sum is σ = 127697664. Its totient is φ = 125702136.

The previous prime is 126699871. The next prime is 126699901. The reversal of 126699899 is 998996621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126699899 is a prime.

It is a super-2 number, since 2×126699899² = 32105728813220402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126699299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498692 + ... + 498945.

It is an arithmetic number, because the mean of its divisors is an integer number (31924416).

Almost surely, 2^126699899 is an apocalyptic number.

126699899 is a deficient number, since it is larger than the sum of its proper divisors (997765).

126699899 is an equidigital number, since it uses as much as digits as its factorization.

126699899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997764.

The product of its digits is 3779136, while the sum is 59.

The square root of 126699899 is about 11256.1049657508. The cubic root of 126699899 is about 502.2563345923.

The spelling of 126699899 in words is "one hundred twenty-six million, six hundred ninety-nine thousand, eight hundred ninety-nine".