3987745 has 4 divisors (see below), whose sum is σ = 4785300. Its totient is φ = 3190192.

The previous prime is 3987733. The next prime is 3987757. The reversal of 3987745 is 5477893.

It is a happy number.

3987745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5477893 = 17 ⋅322229.

It is an interprime number because it is at equal distance from previous prime (3987733) and next prime (3987757).

It can be written as a sum of positive squares in 2 ways, for example, as 3154176 + 833569 = 1776^2 + 913^2 .

It is a cyclic number.

It is not a de Polignac number, because 3987745 - 2¹¹ = 3985697 is a prime.

It is a super-2 number, since 2×3987745² = 31804220370050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398770 + ... + 398779.

It is an arithmetic number, because the mean of its divisors is an integer number (1196325).

Almost surely, 2^3987745 is an apocalyptic number.

It is an amenable number.

3987745 is a deficient number, since it is larger than the sum of its proper divisors (797555).

3987745 is an equidigital number, since it uses as much as digits as its factorization.

3987745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797554.

The product of its digits is 211680, while the sum is 43.

The square root of 3987745 is about 1996.9338997573. The cubic root of 3987745 is about 158.5778260238.

The spelling of 3987745 in words is "three million, nine hundred eighty-seven thousand, seven hundred forty-five".