3651973 has 4 divisors (see below), whose sum is σ = 3932908. Its totient is φ = 3371040.

The previous prime is 3651959. The next prime is 3651979. The reversal of 3651973 is 3791563.

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 199809 + 3452164 = 447^2 + 1858^2 .

It is a cyclic number.

It is not a de Polignac number, because 3651973 - 2¹⁷ = 3520901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3651979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140448 + ... + 140473.

It is an arithmetic number, because the mean of its divisors is an integer number (983227).

Almost surely, 2^3651973 is an apocalyptic number.

It is an amenable number.

3651973 is a deficient number, since it is larger than the sum of its proper divisors (280935).

3651973 is a wasteful number, since it uses less digits than its factorization.

3651973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280934.

The product of its digits is 17010, while the sum is 34.

The square root of 3651973 is about 1911.0136053937. The cubic root of 3651973 is about 153.9959098256.

It can be divided in two parts, 3651 and 973, that added together give a square (4624 = 68²).

The spelling of 3651973 in words is "three million, six hundred fifty-one thousand, nine hundred seventy-three".