126940509 has 12 divisors (see below), whose sum is σ = 183959776. Its totient is φ = 84349512.

The previous prime is 126940507. The next prime is 126940523. The reversal of 126940509 is 905049621.

It is not a de Polignac number, because 126940509 - 2¹ = 126940507 is a prime.

It is a super-2 number, since 2×126940509² = 32227785650358162, 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 (126940507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20209 + ... + 25734.

Almost surely, 2^126940509 is an apocalyptic number.

It is an amenable number.

126940509 is a deficient number, since it is larger than the sum of its proper divisors (57019267).

126940509 is a wasteful number, since it uses less digits than its factorization.

126940509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46256 (or 46253 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 126940509 is about 11266.7878741015. The cubic root of 126940509 is about 502.5740709107.

It can be divided in two parts, 126940 and 509, that added together give a square (127449 = 357²).

The spelling of 126940509 in words is "one hundred twenty-six million, nine hundred forty thousand, five hundred nine".