34307821 has 4 divisors (see below), whose sum is σ = 34320892. Its totient is φ = 34294752.

The previous prime is 34307813. The next prime is 34307827. The reversal of 34307821 is 12870343.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10150596 + 24157225 = 3186^2 + 4915^2 .

It is a cyclic number.

It is not a de Polignac number, because 34307821 - 2³ = 34307813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 34307821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34307827) 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, 1080 + ... + 8353.

It is an arithmetic number, because the mean of its divisors is an integer number (8580223).

Almost surely, 2^34307821 is an apocalyptic number.

It is an amenable number.

34307821 is a deficient number, since it is larger than the sum of its proper divisors (13071).

34307821 is an equidigital number, since it uses as much as digits as its factorization.

34307821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13070.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 34307821 is about 5857.2878536060. The cubic root of 34307821 is about 324.9359116233.

The spelling of 34307821 in words is "thirty-four million, three hundred seven thousand, eight hundred twenty-one".