126640806 has 16 divisors (see below), whose sum is σ = 264294144. Its totient is φ = 40378184.

The previous prime is 126640793. The next prime is 126640807. The reversal of 126640806 is 608046621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126640807) 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, 458706 + ... + 458981.

It is an arithmetic number, because the mean of its divisors is an integer number (16518384).

Almost surely, 2^126640806 is an apocalyptic number.

126640806 is an abundant number, since it is smaller than the sum of its proper divisors (137653338).

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

126640806 is a wasteful number, since it uses less digits than its factorization.

126640806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917715.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 126640806 is about 11253.4797285106. The cubic root of 126640806 is about 502.1782381106.

The spelling of 126640806 in words is "one hundred twenty-six million, six hundred forty thousand, eight hundred six".