4435981 has 12 divisors (see below), whose sum is σ = 4964092. Its totient is φ = 3960000.

The previous prime is 4435969. The next prime is 4435993. The reversal of 4435981 is 1895344.

It is an interprime number because it is at equal distance from previous prime (4435969) and next prime (4435993).

It can be written as a sum of positive squares in 2 ways, for example, as 1713481 + 2722500 = 1309^2 + 1650^2 .

It is not a de Polignac number, because 4435981 - 2⁹ = 4435469 is a prime.

It is a super-2 number, since 2×4435981² = 39355854864722, which contains 22 as substring.

It is a Duffinian number.

4435981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4435961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7081 + ... + 7681.

Almost surely, 2^4435981 is an apocalyptic number.

It is an amenable number.

4435981 is a deficient number, since it is larger than the sum of its proper divisors (528111).

4435981 is a wasteful number, since it uses less digits than its factorization.

4435981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684 (or 673 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 4435981 is about 2106.1768681666. The cubic root of 4435981 is about 164.3097087287.

The spelling of 4435981 in words is "four million, four hundred thirty-five thousand, nine hundred eighty-one".