126640840 has 32 divisors (see below), whose sum is σ = 285768000. Its totient is φ = 50509504.

The previous prime is 126640807. The next prime is 126640847. The reversal of 126640840 is 48046621.

It is not an unprimeable number, because it can be changed into a prime (126640847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9951 + ... + 18769.

It is an arithmetic number, because the mean of its divisors is an integer number (8930250).

Almost surely, 2^126640840 is an apocalyptic number.

126640840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126640840 is an abundant number, since it is smaller than the sum of its proper divisors (159127160).

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

126640840 is a wasteful number, since it uses less digits than its factorization.

126640840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9189 (or 9185 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 126640840 is about 11253.4812391544. The cubic root of 126640840 is about 502.1782830515.

The spelling of 126640840 in words is "one hundred twenty-six million, six hundred forty thousand, eight hundred forty".