3307981 has 4 divisors (see below), whose sum is σ = 3311964. Its totient is φ = 3304000.

The previous prime is 3307973. The next prime is 3308027. The reversal of 3307981 is 1897033.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1897033 = 599 ⋅3167.

It can be written as a sum of positive squares in 2 ways, for example, as 2452356 + 855625 = 1566^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 3307981 - 2³ = 3307973 is a prime.

It is a super-2 number, since 2×3307981² = 21885476592722, 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 (3307781) 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, 220 + ... + 2581.

It is an arithmetic number, because the mean of its divisors is an integer number (827991).

Almost surely, 2^3307981 is an apocalyptic number.

It is an amenable number.

3307981 is a deficient number, since it is larger than the sum of its proper divisors (3983).

3307981 is a wasteful number, since it uses less digits than its factorization.

3307981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 3307981 is about 1818.7855838443. The cubic root of 3307981 is about 149.0004804573. Note that the first 3 decimals are identical.

The spelling of 3307981 in words is "three million, three hundred seven thousand, nine hundred eighty-one".