126401640 has 32 divisors (see below), whose sum is σ = 379205280. Its totient is φ = 33707072.

The previous prime is 126401609. The next prime is 126401641. The reversal of 126401640 is 46104621.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 126401640.

It is not an unprimeable number, because it can be changed into a prime (126401641) 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 7 ways as a sum of consecutive naturals, for example, 526554 + ... + 526793.

It is an arithmetic number, because the mean of its divisors is an integer number (11850165).

Almost surely, 2^126401640 is an apocalyptic number.

126401640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126401640 is an abundant number, since it is smaller than the sum of its proper divisors (252803640).

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

126401640 is a wasteful number, since it uses less digits than its factorization.

126401640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053361 (or 1053357 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 126401640 is about 11242.8483935344. The cubic root of 126401640 is about 501.8619112997.

The spelling of 126401640 in words is "one hundred twenty-six million, four hundred one thousand, six hundred forty".