1040380381 has 2 divisors, whose sum is σ = 1040380382. Its totient is φ = 1040380380.

The previous prime is 1040380379. The next prime is 1040380469. The reversal of 1040380381 is 1830830401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983136025 + 57244356 = 31355^2 + 7566^2 .

It is an emirp because it is prime and its reverse (1830830401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1040380381 - 2¹ = 1040380379 is a prime.

It is a super-2 number, since 2×1040380381² = 2164782674339410322, which contains 22 as substring.

Together with 1040380379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1040380351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520190190 + 520190191.

It is an arithmetic number, because the mean of its divisors is an integer number (520190191).

Almost surely, 2^1040380381 is an apocalyptic number.

It is an amenable number.

1040380381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040380381 is an equidigital number, since it uses as much as digits as its factorization.

1040380381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1040380381 is about 32254.9280110807. The cubic root of 1040380381 is about 1013.2829101059.

The spelling of 1040380381 in words is "one billion, forty million, three hundred eighty thousand, three hundred eighty-one".