3988765 has 24 divisors (see below), whose sum is σ = 5554080. Its totient is φ = 2740320.

The previous prime is 3988763. The next prime is 3988771. The reversal of 3988765 is 5678893.

It is not a de Polignac number, because 3988765 - 2¹ = 3988763 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3988763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11322 + ... + 11668.

It is an arithmetic number, because the mean of its divisors is an integer number (231420).

Almost surely, 2^3988765 is an apocalyptic number.

It is an amenable number.

3988765 is a deficient number, since it is larger than the sum of its proper divisors (1565315).

3988765 is a wasteful number, since it uses less digits than its factorization.

3988765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 382 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The square root of 3988765 is about 1997.1892749562. The cubic root of 3988765 is about 158.5913454099.

It can be divided in two parts, 3988 and 765, that added together give a triangular number (4753 = T₉₇).

The spelling of 3988765 in words is "three million, nine hundred eighty-eight thousand, seven hundred sixty-five".