3952721 has 4 divisors (see below), whose sum is σ = 4185252. Its totient is φ = 3720192.

The previous prime is 3952691. The next prime is 3952733. The reversal of 3952721 is 1272593.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1890625 + 2062096 = 1375^2 + 1436^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3952721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3952771) 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, 116240 + ... + 116273.

It is an arithmetic number, because the mean of its divisors is an integer number (1046313).

Almost surely, 2^3952721 is an apocalyptic number.

It is an amenable number.

3952721 is a deficient number, since it is larger than the sum of its proper divisors (232531).

3952721 is a wasteful number, since it uses less digits than its factorization.

3952721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232530.

The product of its digits is 3780, while the sum is 29.

The square root of 3952721 is about 1988.1451154279. The cubic root of 3952721 is about 158.1122019877.

The spelling of 3952721 in words is "three million, nine hundred fifty-two thousand, seven hundred twenty-one".