3607981 has 12 divisors (see below), whose sum is σ = 4019412. Its totient is φ = 3234816.

The previous prime is 3607979. The next prime is 3607991. The reversal of 3607981 is 1897063.

It can be written as a sum of positive squares in 6 ways, for example, as 126025 + 3481956 = 355^2 + 1866^2 .

It is not a de Polignac number, because 3607981 - 2¹ = 3607979 is a prime.

It is a super-2 number, since 2×3607981² = 26035053792722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3607921) 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 11 ways as a sum of consecutive naturals, for example, 5965 + ... + 6541.

It is an arithmetic number, because the mean of its divisors is an integer number (334951).

Almost surely, 2^3607981 is an apocalyptic number.

It is an amenable number.

3607981 is a deficient number, since it is larger than the sum of its proper divisors (411431).

3607981 is a wasteful number, since it uses less digits than its factorization.

3607981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 3607981 is about 1899.4686099012. The cubic root of 3607981 is about 153.3750605822.

The spelling of 3607981 in words is "three million, six hundred seven thousand, nine hundred eighty-one".