3430721 has 4 divisors (see below), whose sum is σ = 3920832. Its totient is φ = 2940612.

The previous prime is 3430717. The next prime is 3430727. The reversal of 3430721 is 1270343.

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 3430721 - 2² = 3430717 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3430693 and 3430702.

It is not an unprimeable number, because it can be changed into a prime (3430727) 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, 245045 + ... + 245058.

It is an arithmetic number, because the mean of its divisors is an integer number (980208).

Almost surely, 2^3430721 is an apocalyptic number.

It is an amenable number.

3430721 is a deficient number, since it is larger than the sum of its proper divisors (490111).

3430721 is an equidigital number, since it uses as much as digits as its factorization.

3430721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490110.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 3430721 is about 1852.2205592207. The cubic root of 3430721 is about 150.8209945511.

The spelling of 3430721 in words is "three million, four hundred thirty thousand, seven hundred twenty-one".