4389981 has 4 divisors (see below), whose sum is σ = 5853312. Its totient is φ = 2926652.

The previous prime is 4389977. The next prime is 4389989. The reversal of 4389981 is 1899834.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4389981 - 2² = 4389977 is a prime.

It is a super-2 number, since 2×4389981² = 38543866360722, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4389989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 731661 + ... + 731666.

It is an arithmetic number, because the mean of its divisors is an integer number (1463328).

Almost surely, 2^4389981 is an apocalyptic number.

It is an amenable number.

4389981 is a deficient number, since it is larger than the sum of its proper divisors (1463331).

4389981 is a wasteful number, since it uses less digits than its factorization.

4389981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463330.

The product of its digits is 62208, while the sum is 42.

The square root of 4389981 is about 2095.2281498682. The cubic root of 4389981 is about 163.7397841460.

The spelling of 4389981 in words is "four million, three hundred eighty-nine thousand, nine hundred eighty-one".