125821812 has 12 divisors (see below), whose sum is σ = 293584256. Its totient is φ = 41940600.

The previous prime is 125821783. The next prime is 125821831. The reversal of 125821812 is 218128521.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×125821812² = 31662256749926688, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 125821812.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5242564 + ... + 5242587.

Almost surely, 2^125821812 is an apocalyptic number.

125821812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

125821812 is an abundant number, since it is smaller than the sum of its proper divisors (167762444).

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

125821812 is a wasteful number, since it uses less digits than its factorization.

125821812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10485158 (or 10485156 counting only the distinct ones).

The product of its digits is 2560, while the sum is 30.

The square root of 125821812 is about 11217.0322278221. The cubic root of 125821812 is about 501.0933567327.

The spelling of 125821812 in words is "one hundred twenty-five million, eight hundred twenty-one thousand, eight hundred twelve".