126391639 has 6 divisors (see below), whose sum is σ = 138926480. Its totient is φ = 114901380.

The previous prime is 126391637. The next prime is 126391649. The reversal of 126391639 is 936193621.

It is not a de Polignac number, because 126391639 - 2¹ = 126391637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126391631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 522159 + ... + 522400.

Almost surely, 2^126391639 is an apocalyptic number.

126391639 is a deficient number, since it is larger than the sum of its proper divisors (12534841).

126391639 is a wasteful number, since it uses less digits than its factorization.

126391639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044581 (or 1044570 counting only the distinct ones).

The product of its digits is 52488, while the sum is 40.

The square root of 126391639 is about 11242.4036131069. The cubic root of 126391639 is about 501.8486750438.

The spelling of 126391639 in words is "one hundred twenty-six million, three hundred ninety-one thousand, six hundred thirty-nine".