2237981 has 4 divisors (see below), whose sum is σ = 2243964. Its totient is φ = 2232000.

The previous prime is 2237957. The next prime is 2238011. The reversal of 2237981 is 1897322.

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 1651225 + 586756 = 1285^2 + 766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2237981 is a prime.

It is a super-2 number, since 2×2237981² = 10017117912722, 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 (2237941) 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, 2390 + ... + 3191.

It is an arithmetic number, because the mean of its divisors is an integer number (560991).

2^2237981 is an apocalyptic number.

It is an amenable number.

2237981 is a deficient number, since it is larger than the sum of its proper divisors (5983).

2237981 is an equidigital number, since it uses as much as digits as its factorization.

2237981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5982.

The product of its digits is 6048, while the sum is 32.

The square root of 2237981 is about 1495.9883020933. The cubic root of 2237981 is about 130.8033293831.

The spelling of 2237981 in words is "two million, two hundred thirty-seven thousand, nine hundred eighty-one".