400071407381 has 2 divisors, whose sum is σ = 400071407382. Its totient is φ = 400071407380.

The previous prime is 400071407371. The next prime is 400071407453. The reversal of 400071407381 is 183704170004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276565551025 + 123505856356 = 525895^2 + 351434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400071407381 is a prime.

It is a super-2 number, since 2×400071407381² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400071407371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200035703690 + 200035703691.

It is an arithmetic number, because the mean of its divisors is an integer number (200035703691).

Almost surely, 2^400071407381 is an apocalyptic number.

It is an amenable number.

400071407381 is a deficient number, since it is larger than the sum of its proper divisors (1).

400071407381 is an equidigital number, since it uses as much as digits as its factorization.

400071407381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

Adding to 400071407381 its reverse (183704170004), we get a palindrome (583775577385).

The spelling of 400071407381 in words is "four hundred billion, seventy-one million, four hundred seven thousand, three hundred eighty-one".