3987723 has 4 divisors (see below), whose sum is σ = 5316968. Its totient is φ = 2658480.

The previous prime is 3987677. The next prime is 3987727. The reversal of 3987723 is 3277893.

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

It is not a de Polignac number, because 3987723 - 2¹⁰ = 3986699 is a prime.

It is a D-number.

It is a Duffinian number.

3987723 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3987727) 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, 664618 + ... + 664623.

It is an arithmetic number, because the mean of its divisors is an integer number (1329242).

Almost surely, 2^3987723 is an apocalyptic number.

3987723 is a deficient number, since it is larger than the sum of its proper divisors (1329245).

3987723 is a wasteful number, since it uses less digits than its factorization.

3987723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329244.

The product of its digits is 63504, while the sum is 39.

The square root of 3987723 is about 1996.9283913050. The cubic root of 3987723 is about 158.5775344038.

The spelling of 3987723 in words is "three million, nine hundred eighty-seven thousand, seven hundred twenty-three".