4004981 has 4 divisors (see below), whose sum is σ = 4022700. Its totient is φ = 3987264.

The previous prime is 4004951. The next prime is 4004989. The reversal of 4004981 is 1894004.

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 1540081 + 2464900 = 1241^2 + 1570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4004981 is a prime.

It is a super-2 number, since 2×4004981² = 32079745620722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4004981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4004989) 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, 8516 + ... + 8973.

It is an arithmetic number, because the mean of its divisors is an integer number (1005675).

Almost surely, 2^4004981 is an apocalyptic number.

It is an amenable number.

4004981 is a deficient number, since it is larger than the sum of its proper divisors (17719).

4004981 is a wasteful number, since it uses less digits than its factorization.

4004981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17718.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 4004981 is about 2001.2448625793. The cubic root of 4004981 is about 158.8059682377.

Adding to 4004981 its reverse (1894004), we get a palindrome (5898985).

The spelling of 4004981 in words is "four million, four thousand, nine hundred eighty-one".