3547921 has 4 divisors (see below), whose sum is σ = 3820852. Its totient is φ = 3274992.

The previous prime is 3547913. The next prime is 3547931. The reversal of 3547921 is 1297453.

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 923521 + 2624400 = 961^2 + 1620^2 .

It is a cyclic number.

It is not a de Polignac number, because 3547921 - 2³ = 3547913 is a prime.

It is a d-powerful number, because it can be written as 3¹³ + 5⁹ + 4⁴ + 7 + 9² + 2⁷ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3547931) 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, 136446 + ... + 136471.

It is an arithmetic number, because the mean of its divisors is an integer number (955213).

Almost surely, 2^3547921 is an apocalyptic number.

It is an amenable number.

3547921 is a deficient number, since it is larger than the sum of its proper divisors (272931).

3547921 is a wasteful number, since it uses less digits than its factorization.

3547921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272930.

The product of its digits is 7560, while the sum is 31.

The square root of 3547921 is about 1883.5925780274. The cubic root of 3547921 is about 152.5192450853.

The spelling of 3547921 in words is "three million, five hundred forty-seven thousand, nine hundred twenty-one".