126838406640 has 160 divisors (see below), whose sum is σ = 443735884800. Its totient is φ = 29688386560.

The previous prime is 126838406573. The next prime is 126838406657. The reversal of 126838406640 is 46604838621.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 126838406640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 751800 + ... + 904919.

It is an arithmetic number, because the mean of its divisors is an integer number (2773349280).

Almost surely, 2^126838406640 is an apocalyptic number.

126838406640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126838406640 is an abundant number, since it is smaller than the sum of its proper divisors (316897478160).

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

126838406640 is a wasteful number, since it uses less digits than its factorization.

126838406640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656775 (or 1656769 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 126838406640 in words is "one hundred twenty-six billion, eight hundred thirty-eight million, four hundred six thousand, six hundred forty".