862808421 has 4 divisors (see below), whose sum is σ = 1150411232. Its totient is φ = 575205612.

The previous prime is 862808417. The next prime is 862808483. The reversal of 862808421 is 124808268.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 862808421 - 2² = 862808417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 862808421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (862808491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143801401 + ... + 143801406.

It is an arithmetic number, because the mean of its divisors is an integer number (287602808).

Almost surely, 2^862808421 is an apocalyptic number.

It is an amenable number.

862808421 is a deficient number, since it is larger than the sum of its proper divisors (287602811).

862808421 is a wasteful number, since it uses less digits than its factorization.

862808421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287602810.

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 862808421 is about 29373.6007496527. The cubic root of 862808421 is about 952.0025793336.

The spelling of 862808421 in words is "eight hundred sixty-two million, eight hundred eight thousand, four hundred twenty-one".