126721840 has 60 divisors (see below), whose sum is σ = 342741456. Its totient is φ = 43446144.

The previous prime is 126721813. The next prime is 126721843. The reversal of 126721840 is 48127621.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (126721843) 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, 12244 + ... + 20083.

Almost surely, 2^126721840 is an apocalyptic number.

126721840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126721840 is an abundant number, since it is smaller than the sum of its proper divisors (216019616).

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

126721840 is a wasteful number, since it uses less digits than its factorization.

126721840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32354 (or 32341 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 126721840 is about 11257.0795502208. The cubic root of 126721840 is about 502.2853253288.

The spelling of 126721840 in words is "one hundred twenty-six million, seven hundred twenty-one thousand, eight hundred forty".