34384721 has 10 divisors (see below), whose sum is σ = 40115922. Its totient is φ = 29470560.

The previous prime is 34384717. The next prime is 34384733. The reversal of 34384721 is 12748343.

It can be written as a sum of positive squares in only one way, i.e., 19018321 + 15366400 = 4361^2 + 3920^2 .

It is not a de Polignac number, because 34384721 - 2² = 34384717 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34384781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4760 + ... + 9561.

Almost surely, 2^34384721 is an apocalyptic number.

It is an amenable number.

34384721 is a deficient number, since it is larger than the sum of its proper divisors (5731201).

34384721 is an frugal number, since it uses more digits than its factorization.

34384721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14349 (or 14328 counting only the distinct ones).

The product of its digits is 16128, while the sum is 32.

The square root of 34384721 is about 5863.8486508436. The cubic root of 34384721 is about 325.1785086410.

The spelling of 34384721 in words is "thirty-four million, three hundred eighty-four thousand, seven hundred twenty-one".