126939791 has 4 divisors (see below), whose sum is σ = 138479784. Its totient is φ = 115399800.

The previous prime is 126939781. The next prime is 126939847. The reversal of 126939791 is 197939621.

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-126939791 is a prime.

It is a super-2 number, since 2×126939791² = 32227421078247362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126939751) 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, 5769980 + ... + 5770001.

It is an arithmetic number, because the mean of its divisors is an integer number (34619946).

Almost surely, 2^126939791 is an apocalyptic number.

126939791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126939791 is a deficient number, since it is larger than the sum of its proper divisors (11539993).

126939791 is a wasteful number, since it uses less digits than its factorization.

126939791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11539992.

The product of its digits is 183708, while the sum is 47.

The square root of 126939791 is about 11266.7560104939. The cubic root of 126939791 is about 502.5731233570.

The spelling of 126939791 in words is "one hundred twenty-six million, nine hundred thirty-nine thousand, seven hundred ninety-one".