1681872126 has 32 divisors (see below), whose sum is σ = 3693862656. Its totient is φ = 506280000.

The previous prime is 1681872121. The next prime is 1681872149. The reversal of 1681872126 is 6212781861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681872121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74415 + ... + 94346.

It is an arithmetic number, because the mean of its divisors is an integer number (115433208).

Almost surely, 2^1681872126 is an apocalyptic number.

1681872126 is an abundant number, since it is smaller than the sum of its proper divisors (2011990530).

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

1681872126 is a wasteful number, since it uses less digits than its factorization.

1681872126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168928.

The product of its digits is 64512, while the sum is 42.

The square root of 1681872126 is about 41010.6343037998. The cubic root of 1681872126 is about 1189.2258048358.

The spelling of 1681872126 in words is "one billion, six hundred eighty-one million, eight hundred seventy-two thousand, one hundred twenty-six".