4037981 has 2 divisors, whose sum is σ = 4037982. Its totient is φ = 4037980.

The previous prime is 4037963. The next prime is 4037987. The reversal of 4037981 is 1897304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4020025 + 17956 = 2005^2 + 134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4037981 is a prime.

It is a super-2 number, since 2×4037981² = 32610581112722, which contains 22 as substring.

It is a Chen prime.

It is equal to p₂₈₅₆₇₄ and since 4037981 and 285674 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4037987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2018990 + 2018991.

It is an arithmetic number, because the mean of its divisors is an integer number (2018991).

Almost surely, 2^4037981 is an apocalyptic number.

It is an amenable number.

4037981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4037981 is an equidigital number, since it uses as much as digits as its factorization.

4037981 is an odious number, because the sum of its binary digits is odd.

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

The square root of 4037981 is about 2009.4728164372. The cubic root of 4037981 is about 159.2409489749.

The spelling of 4037981 in words is "four million, thirty-seven thousand, nine hundred eighty-one".