439422864821 has 4 divisors (see below), whose sum is σ = 465271268652. Its totient is φ = 413574460992.

The previous prime is 439422864817. The next prime is 439422864833. The reversal of 439422864821 is 128468224934.

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 281790043921 + 157632820900 = 530839^2 + 397030^2 .

It is a cyclic number.

It is not a de Polignac number, because 439422864821 - 2² = 439422864817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439422864871) 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, 12924201890 + ... + 12924201923.

It is an arithmetic number, because the mean of its divisors is an integer number (116317817163).

Almost surely, 2^439422864821 is an apocalyptic number.

It is an amenable number.

439422864821 is a deficient number, since it is larger than the sum of its proper divisors (25848403831).

439422864821 is a wasteful number, since it uses less digits than its factorization.

439422864821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25848403830.

The product of its digits is 5308416, while the sum is 53.

The spelling of 439422864821 in words is "four hundred thirty-nine billion, four hundred twenty-two million, eight hundred sixty-four thousand, eight hundred twenty-one".