4309981 has 4 divisors (see below), whose sum is σ = 4641532. Its totient is φ = 3978432.

The previous prime is 4309957. The next prime is 4310021. The reversal of 4309981 is 1899034.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1899034 = 2 ⋅949517.

It can be written as a sum of positive squares in 2 ways, for example, as 737881 + 3572100 = 859^2 + 1890^2 .

It is a cyclic number.

It is not a de Polignac number, because 4309981 - 2¹³ = 4301789 is a prime.

It is a super-2 number, since 2×4309981² = 37151872440722, 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 (4301981) 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, 165756 + ... + 165781.

It is an arithmetic number, because the mean of its divisors is an integer number (1160383).

Almost surely, 2^4309981 is an apocalyptic number.

It is an amenable number.

4309981 is a deficient number, since it is larger than the sum of its proper divisors (331551).

4309981 is a wasteful number, since it uses less digits than its factorization.

4309981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331550.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 4309981 is about 2076.0493732086. The cubic root of 4309981 is about 162.7390532852.

The spelling of 4309981 in words is "four million, three hundred nine thousand, nine hundred eighty-one".