126738791 has 4 divisors (see below), whose sum is σ = 134194032. Its totient is φ = 119283552.

The previous prime is 126738709. The next prime is 126738793. The reversal of 126738791 is 197837621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 197837621 = 379 ⋅521999.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126738791 is a prime.

It is a super-2 number, since 2×126738791² = 32125442288283362, 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 (126738793) 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, 3727595 + ... + 3727628.

It is an arithmetic number, because the mean of its divisors is an integer number (33548508).

Almost surely, 2^126738791 is an apocalyptic number.

126738791 is a deficient number, since it is larger than the sum of its proper divisors (7455241).

126738791 is an equidigital number, since it uses as much as digits as its factorization.

126738791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7455240.

The product of its digits is 127008, while the sum is 44.

The square root of 126738791 is about 11257.8324290247. The cubic root of 126738791 is about 502.3077204659.

The spelling of 126738791 in words is "one hundred twenty-six million, seven hundred thirty-eight thousand, seven hundred ninety-one".