400404073393 has 2 divisors, whose sum is σ = 400404073394. Its totient is φ = 400404073392.

The previous prime is 400404073357. The next prime is 400404073403. The reversal of 400404073393 is 393370404004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214898999184 + 185505074209 = 463572^2 + 430703^2 .

It is a cyclic number.

It is not a de Polignac number, because 400404073393 - 2²¹ = 400401976241 is a prime.

It is not a weakly prime, because it can be changed into another prime (400404073313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200202036696 + 200202036697.

It is an arithmetic number, because the mean of its divisors is an integer number (200202036697).

Almost surely, 2^400404073393 is an apocalyptic number.

It is an amenable number.

400404073393 is a deficient number, since it is larger than the sum of its proper divisors (1).

400404073393 is an equidigital number, since it uses as much as digits as its factorization.

400404073393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 37.

Adding to 400404073393 its reverse (393370404004), we get a palindrome (793774477397).

The spelling of 400404073393 in words is "four hundred billion, four hundred four million, seventy-three thousand, three hundred ninety-three".