4387981 has 4 divisors (see below), whose sum is σ = 4725532. Its totient is φ = 4050432.

The previous prime is 4387979. The next prime is 4387987. The reversal of 4387981 is 1897834.

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 872356 + 3515625 = 934^2 + 1875^2 .

It is a cyclic number.

It is not a de Polignac number, because 4387981 - 2¹ = 4387979 is a prime.

It is a super-2 number, since 2×4387981² = 38508754512722, 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 (4387987) by changing a digit.

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, 168756 + ... + 168781.

It is an arithmetic number, because the mean of its divisors is an integer number (1181383).

Almost surely, 2^4387981 is an apocalyptic number.

It is an amenable number.

4387981 is a deficient number, since it is larger than the sum of its proper divisors (337551).

4387981 is a wasteful number, since it uses less digits than its factorization.

4387981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337550.

The product of its digits is 48384, while the sum is 40.

The square root of 4387981 is about 2094.7508205035. The cubic root of 4387981 is about 163.7149146904.

The spelling of 4387981 in words is "four million, three hundred eighty-seven thousand, nine hundred eighty-one".