400855612393 has 2 divisors, whose sum is σ = 400855612394. Its totient is φ = 400855612392.

The previous prime is 400855612247. The next prime is 400855612459. The reversal of 400855612393 is 393216558004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396028558864 + 4827053529 = 629308^2 + 69477^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400855612393 is a prime.

It is not a weakly prime, because it can be changed into another prime (400855613393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200427806196 + 200427806197.

It is an arithmetic number, because the mean of its divisors is an integer number (200427806197).

Almost surely, 2^400855612393 is an apocalyptic number.

It is an amenable number.

400855612393 is a deficient number, since it is larger than the sum of its proper divisors (1).

400855612393 is an equidigital number, since it uses as much as digits as its factorization.

400855612393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 400855612393 in words is "four hundred billion, eight hundred fifty-five million, six hundred twelve thousand, three hundred ninety-three".