400040737381 has 2 divisors, whose sum is σ = 400040737382. Its totient is φ = 400040737380.

The previous prime is 400040737321. The next prime is 400040737403. The reversal of 400040737381 is 183737040004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 359172476100 + 40868261281 = 599310^2 + 202159^2 .

It is a cyclic number.

It is not a de Polignac number, because 400040737381 - 2¹⁷ = 400040606309 is a prime.

It is a super-2 number, since 2×400040737381² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400040737381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400040737321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200020368690 + 200020368691.

It is an arithmetic number, because the mean of its divisors is an integer number (200020368691).

Almost surely, 2^400040737381 is an apocalyptic number.

It is an amenable number.

400040737381 is a deficient number, since it is larger than the sum of its proper divisors (1).

400040737381 is an equidigital number, since it uses as much as digits as its factorization.

400040737381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 37.

Adding to 400040737381 its reverse (183737040004), we get a palindrome (583777777385).

The spelling of 400040737381 in words is "four hundred billion, forty million, seven hundred thirty-seven thousand, three hundred eighty-one".