3256721 has 8 divisors (see below), whose sum is σ = 3521280. Its totient is φ = 2994192.

The previous prime is 3256717. The next prime is 3256723. The reversal of 3256721 is 1276523.

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 3256721 - 2² = 3256717 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3256723) 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, 5966 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (440160).

Almost surely, 2^3256721 is an apocalyptic number.

It is an amenable number.

3256721 is a deficient number, since it is larger than the sum of its proper divisors (264559).

3256721 is a wasteful number, since it uses less digits than its factorization.

3256721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015.

The product of its digits is 2520, while the sum is 26.

The square root of 3256721 is about 1804.6387450124. The cubic root of 3256721 is about 148.2268404796.

The spelling of 3256721 in words is "three million, two hundred fifty-six thousand, seven hundred twenty-one".