34389821 has 4 divisors (see below), whose sum is σ = 34447644. Its totient is φ = 34332000.

The previous prime is 34389811. The next prime is 34389863. The reversal of 34389821 is 12898343.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12898343 = 593 ⋅21751.

It can be written as a sum of positive squares in 2 ways, for example, as 32330596 + 2059225 = 5686^2 + 1435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-34389821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34389811) 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, 28010 + ... + 29211.

It is an arithmetic number, because the mean of its divisors is an integer number (8611911).

Almost surely, 2^34389821 is an apocalyptic number.

It is an amenable number.

34389821 is a deficient number, since it is larger than the sum of its proper divisors (57823).

34389821 is an equidigital number, since it uses as much as digits as its factorization.

34389821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57822.

The product of its digits is 41472, while the sum is 38.

The square root of 34389821 is about 5864.2835026966. The cubic root of 34389821 is about 325.1945848551.

The spelling of 34389821 in words is "thirty-four million, three hundred eighty-nine thousand, eight hundred twenty-one".