126391966 has 4 divisors (see below), whose sum is σ = 189587952. Its totient is φ = 63195982.

The previous prime is 126391943. The next prime is 126391973. The reversal of 126391966 is 669193621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 669193621 = 31 ⋅21586891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31597990 + ... + 31597993.

It is an arithmetic number, because the mean of its divisors is an integer number (47396988).

Almost surely, 2^126391966 is an apocalyptic number.

126391966 is a deficient number, since it is larger than the sum of its proper divisors (63195986).

126391966 is an equidigital number, since it uses as much as digits as its factorization.

126391966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63195985.

The product of its digits is 104976, while the sum is 43.

The square root of 126391966 is about 11242.4181562509. The cubic root of 126391966 is about 501.8491078371.

The spelling of 126391966 in words is "one hundred twenty-six million, three hundred ninety-one thousand, nine hundred sixty-six".