84400321 has 4 divisors (see below), whose sum is σ = 87122944. Its totient is φ = 81677700.

The previous prime is 84400319. The next prime is 84400331. The reversal of 84400321 is 12300448.

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 a cyclic number.

It is not a de Polignac number, because 84400321 - 2¹ = 84400319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84400292 and 84400301.

It is not an unprimeable number, because it can be changed into a prime (84400331) 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, 1361265 + ... + 1361326.

It is an arithmetic number, because the mean of its divisors is an integer number (21780736).

Almost surely, 2^84400321 is an apocalyptic number.

It is an amenable number.

84400321 is a deficient number, since it is larger than the sum of its proper divisors (2722623).

84400321 is a wasteful number, since it uses less digits than its factorization.

84400321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722622.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 84400321 is about 9186.9647327069. The cubic root of 84400321 is about 438.6465313381.

Adding to 84400321 its reverse (12300448), we get a palindrome (96700769).

The spelling of 84400321 in words is "eighty-four million, four hundred thousand, three hundred twenty-one".