34405721 has 8 divisors (see below), whose sum is σ = 39549504. Its totient is φ = 29319120.

The previous prime is 34405717. The next prime is 34405727. The reversal of 34405721 is 12750443.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 34405721 - 2² = 34405717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (34405727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12995 + ... + 15416.

It is an arithmetic number, because the mean of its divisors is an integer number (4943688).

Almost surely, 2^34405721 is an apocalyptic number.

It is an amenable number.

34405721 is a deficient number, since it is larger than the sum of its proper divisors (5143783).

34405721 is a wasteful number, since it uses less digits than its factorization.

34405721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28591.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 34405721 is about 5865.6390103722. The cubic root of 34405721 is about 325.2446946171.

The spelling of 34405721 in words is "thirty-four million, four hundred five thousand, seven hundred twenty-one".