34721813 has 4 divisors (see below), whose sum is σ = 39682080. Its totient is φ = 29761548.

The previous prime is 34721809. The next prime is 34721833. The reversal of 34721813 is 31812743.

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 34721813 - 2² = 34721809 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 (34721833) 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, 2480123 + ... + 2480136.

It is an arithmetic number, because the mean of its divisors is an integer number (9920520).

Almost surely, 2^34721813 is an apocalyptic number.

It is an amenable number.

34721813 is a deficient number, since it is larger than the sum of its proper divisors (4960267).

34721813 is an equidigital number, since it uses as much as digits as its factorization.

34721813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4960266.

The product of its digits is 4032, while the sum is 29.

The square root of 34721813 is about 5892.5217861286. The cubic root of 34721813 is about 326.2376884517.

The spelling of 34721813 in words is "thirty-four million, seven hundred twenty-one thousand, eight hundred thirteen".