863862121 has 4 divisors (see below), whose sum is σ = 893650500. Its totient is φ = 834073744.

The previous prime is 863862119. The next prime is 863862143. The reversal of 863862121 is 121268368.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 710968896 + 152893225 = 26664^2 + 12365^2 .

It is a cyclic number.

It is not a de Polignac number, because 863862121 - 2¹ = 863862119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863862101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14894146 + ... + 14894203.

It is an arithmetic number, because the mean of its divisors is an integer number (223412625).

Almost surely, 2^863862121 is an apocalyptic number.

It is an amenable number.

863862121 is a deficient number, since it is larger than the sum of its proper divisors (29788379).

863862121 is a wasteful number, since it uses less digits than its factorization.

863862121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29788378.

The product of its digits is 27648, while the sum is 37.

The square root of 863862121 is about 29391.5314504025. The cubic root of 863862121 is about 952.3899643029.

The spelling of 863862121 in words is "eight hundred sixty-three million, eight hundred sixty-two thousand, one hundred twenty-one".