872413821 has 10 divisors (see below), whose sum is σ = 1303235582. Its totient is φ = 581609160.

The previous prime is 872413819. The next prime is 872413831. The reversal of 872413821 is 128314278.

It can be written as a sum of positive squares in only one way, i.e., 824264100 + 48149721 = 28710^2 + 6939^2 .

It is not a de Polignac number, because 872413821 - 2¹ = 872413819 is a prime.

It is a super-2 number, since 2×872413821² = 1522211750143640082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872413831) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5385190 + ... + 5385351.

Almost surely, 2^872413821 is an apocalyptic number.

872413821 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

872413821 is a deficient number, since it is larger than the sum of its proper divisors (430821761).

872413821 is a wasteful number, since it uses less digits than its factorization.

872413821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10770553 (or 10770544 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 872413821 is about 29536.6521630330. The cubic root of 872413821 is about 955.5223410069.

The spelling of 872413821 in words is "eight hundred seventy-two million, four hundred thirteen thousand, eight hundred twenty-one".