1403981 has 2 divisors, whose sum is σ = 1403982. Its totient is φ = 1403980.

The previous prime is 1403971. The next prime is 1404059. The reversal of 1403981 is 1893041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1144900 + 259081 = 1070^2 + 509^2 .

It is a cyclic number.

It is not a de Polignac number, because 1403981 - 2¹⁰ = 1402957 is a prime.

It is a super-2 number, since 2×1403981² = 3942325296722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1403981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1403921) 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, 701990 + 701991.

It is an arithmetic number, because the mean of its divisors is an integer number (701991).

2^1403981 is an apocalyptic number.

It is an amenable number.

1403981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1403981 is an equidigital number, since it uses as much as digits as its factorization.

1403981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1403981 is about 1184.8970419408. The cubic root of 1403981 is about 111.9748295903.

The spelling of 1403981 in words is "one million, four hundred three thousand, nine hundred eighty-one".