3645751 has 4 divisors (see below), whose sum is σ = 3661632. Its totient is φ = 3629872.

The previous prime is 3645749. The next prime is 3645767. The reversal of 3645751 is 1575463.

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

It is a cyclic number.

It is not a de Polignac number, because 3645751 - 2¹ = 3645749 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

3645751 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645731) 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, 7591 + ... + 8056.

It is an arithmetic number, because the mean of its divisors is an integer number (915408).

Almost surely, 2^3645751 is an apocalyptic number.

3645751 is a deficient number, since it is larger than the sum of its proper divisors (15881).

3645751 is a wasteful number, since it uses less digits than its factorization.

3645751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15880.

The product of its digits is 12600, while the sum is 31.

The square root of 3645751 is about 1909.3849795157. The cubic root of 3645751 is about 153.9084039560.

The spelling of 3645751 in words is "three million, six hundred forty-five thousand, seven hundred fifty-one".