4387645 has 12 divisors (see below), whose sum is σ = 5419764. Its totient is φ = 3409920.

The previous prime is 4387633. The next prime is 4387661. The reversal of 4387645 is 5467834.

It can be written as a sum of positive squares in 6 ways, for example, as 1473796 + 2913849 = 1214^2 + 1707^2 .

It is not a de Polignac number, because 4387645 - 2⁷ = 4387517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a d-powerful number, because it can be written as 4⁴ + 3¹³ + 8 + 7⁷ + 6 + 4⁷ + 5⁹ .

It is a Duffinian number.

Its product of digits (80640) is a multiple of the sum of its prime factors (720).

4387645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6525 + ... + 7165.

It is an arithmetic number, because the mean of its divisors is an integer number (451647).

Almost surely, 2^4387645 is an apocalyptic number.

It is an amenable number.

4387645 is a deficient number, since it is larger than the sum of its proper divisors (1032119).

4387645 is an equidigital number, since it uses as much as digits as its factorization.

4387645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720 (or 683 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

The square root of 4387645 is about 2094.6706184983. The cubic root of 4387645 is about 163.7107358805.

The spelling of 4387645 in words is "four million, three hundred eighty-seven thousand, six hundred forty-five".