126682391 has 4 divisors (see below), whose sum is σ = 138198984. Its totient is φ = 115165800.

The previous prime is 126682357. The next prime is 126682447. The reversal of 126682391 is 193286621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193286621 = 11 ⋅17571511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126682391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126682331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5758280 + ... + 5758301.

It is an arithmetic number, because the mean of its divisors is an integer number (34549746).

Almost surely, 2^126682391 is an apocalyptic number.

126682391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126682391 is a deficient number, since it is larger than the sum of its proper divisors (11516593).

126682391 is a wasteful number, since it uses less digits than its factorization.

126682391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11516592.

The product of its digits is 31104, while the sum is 38.

The square root of 126682391 is about 11255.3272275843. The cubic root of 126682391 is about 502.2331987965.

The spelling of 126682391 in words is "one hundred twenty-six million, six hundred eighty-two thousand, three hundred ninety-one".