42404236393 has 2 divisors, whose sum is σ = 42404236394. Its totient is φ = 42404236392.

The previous prime is 42404236339. The next prime is 42404236403. The reversal of 42404236393 is 39363240424.

Together with previous prime (42404236339) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42358579344 + 45657049 = 205812^2 + 6757^2 .

It is a cyclic number.

It is not a de Polignac number, because 42404236393 - 2¹³ = 42404228201 is a prime.

It is not a weakly prime, because it can be changed into another prime (42404236313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21202118196 + 21202118197.

It is an arithmetic number, because the mean of its divisors is an integer number (21202118197).

Almost surely, 2^42404236393 is an apocalyptic number.

It is an amenable number.

42404236393 is a deficient number, since it is larger than the sum of its proper divisors (1).

42404236393 is an equidigital number, since it uses as much as digits as its factorization.

42404236393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 40.

The spelling of 42404236393 in words is "forty-two billion, four hundred four million, two hundred thirty-six thousand, three hundred ninety-three".