3988861 has 4 divisors (see below), whose sum is σ = 4012092. Its totient is φ = 3965632.

The previous prime is 3988823. The next prime is 3988877. The reversal of 3988861 is 1688893.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3728761 + 260100 = 1931^2 + 510^2 .

It is a cyclic number.

It is not a de Polignac number, because 3988861 - 2¹¹ = 3986813 is a prime.

It is a super-2 number, since 2×3988861² = 31822024154642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3988661) 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, 11356 + ... + 11701.

It is an arithmetic number, because the mean of its divisors is an integer number (1003023).

Almost surely, 2^3988861 is an apocalyptic number.

It is an amenable number.

3988861 is a deficient number, since it is larger than the sum of its proper divisors (23231).

3988861 is a wasteful number, since it uses less digits than its factorization.

3988861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23230.

The product of its digits is 82944, while the sum is 43.

The square root of 3988861 is about 1997.2133085877. The cubic root of 3988861 is about 158.5926177041.

Subtracting from 3988861 its reverse (1688893), we obtain a cube (2299968 = 132³).

The spelling of 3988861 in words is "three million, nine hundred eighty-eight thousand, eight hundred sixty-one".