2400403981 has 2 divisors, whose sum is σ = 2400403982. Its totient is φ = 2400403980.

The previous prime is 2400403963. The next prime is 2400404033. The reversal of 2400403981 is 1893040042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1753515625 + 646888356 = 41875^2 + 25434^2 .

It is a cyclic number.

It is not a de Polignac number, because 2400403981 - 2⁷ = 2400403853 is a prime.

It is a super-2 number, since 2×2400403981² = 11523878544001296722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2400463981) 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 as a sum of consecutive naturals, namely, 1200201990 + 1200201991.

It is an arithmetic number, because the mean of its divisors is an integer number (1200201991).

Almost surely, 2^2400403981 is an apocalyptic number.

It is an amenable number.

2400403981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2400403981 is an equidigital number, since it uses as much as digits as its factorization.

2400403981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 2400403981 is about 48993.9177959877. The cubic root of 2400403981 is about 1338.9410176699.

The spelling of 2400403981 in words is "two billion, four hundred million, four hundred three thousand, nine hundred eighty-one".