126439640 has 48 divisors (see below), whose sum is σ = 289869840. Its totient is φ = 49627200.

The previous prime is 126439639. The next prime is 126439757. The reversal of 126439640 is 46934621.

It is a self number, because there is not a number n which added to its sum of digits gives 126439640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 599135 + ... + 599345.

It is an arithmetic number, because the mean of its divisors is an integer number (6038955).

Almost surely, 2^126439640 is an apocalyptic number.

126439640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 126439640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144934920).

126439640 is an abundant number, since it is smaller than the sum of its proper divisors (163430200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

126439640 is an equidigital number, since it uses as much as digits as its factorization.

126439640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 126439640 is about 11244.5382297362. The cubic root of 126439640 is about 501.9121976775.

It can be divided in two parts, 1264 and 39640, that added together give a palindrome (40904).

The spelling of 126439640 in words is "one hundred twenty-six million, four hundred thirty-nine thousand, six hundred forty".