1837981 has 2 divisors, whose sum is σ = 1837982. Its totient is φ = 1837980.

The previous prime is 1837973. The next prime is 1838033. The reversal of 1837981 is 1897381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1602756 + 235225 = 1266^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1837981 - 2³ = 1837973 is a prime.

It is a super-2 number, since 2×1837981² = 6756348312722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1837981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1837931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 918990 + 918991.

It is an arithmetic number, because the mean of its divisors is an integer number (918991).

2^1837981 is an apocalyptic number.

It is an amenable number.

1837981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1837981 is an equidigital number, since it uses as much as digits as its factorization.

1837981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

The square root of 1837981 is about 1355.7215790862. The cubic root of 1837981 is about 122.4936773080.

The spelling of 1837981 in words is "one million, eight hundred thirty-seven thousand, nine hundred eighty-one".