400811811397 has 2 divisors, whose sum is σ = 400811811398. Its totient is φ = 400811811396.

The previous prime is 400811811377. The next prime is 400811811467. The reversal of 400811811397 is 793118118004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392309311716 + 8502499681 = 626346^2 + 92209^2 .

It is a cyclic number.

It is not a de Polignac number, because 400811811397 - 2¹⁹ = 400811287109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400811811377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200405905698 + 200405905699.

It is an arithmetic number, because the mean of its divisors is an integer number (200405905699).

Almost surely, 2^400811811397 is an apocalyptic number.

It is an amenable number.

400811811397 is a deficient number, since it is larger than the sum of its proper divisors (1).

400811811397 is an equidigital number, since it uses as much as digits as its factorization.

400811811397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 43.

The spelling of 400811811397 in words is "four hundred billion, eight hundred eleven million, eight hundred eleven thousand, three hundred ninety-seven".