871401820 has 12 divisors (see below), whose sum is σ = 1829943864. Its totient is φ = 348560720.

The previous prime is 871401787. The next prime is 871401833. The reversal of 871401820 is 28104178.

871401820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×871401820² = 1518682263798624800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21785026 + ... + 21785065.

It is an arithmetic number, because the mean of its divisors is an integer number (152495322).

Almost surely, 2^871401820 is an apocalyptic number.

It is an amenable number.

871401820 is an abundant number, since it is smaller than the sum of its proper divisors (958542044).

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

871401820 is a wasteful number, since it uses less digits than its factorization.

871401820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43570100 (or 43570098 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 871401820 is about 29519.5159174401. The cubic root of 871401820 is about 955.1527290615.

Adding to 871401820 its reverse (28104178), we get a palindrome (899505998).

The spelling of 871401820 in words is "eight hundred seventy-one million, four hundred one thousand, eight hundred twenty".