399785038633 has 2 divisors, whose sum is σ = 399785038634. Its totient is φ = 399785038632.

The previous prime is 399785038613. The next prime is 399785038651. The reversal of 399785038633 is 336830587993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394801102224 + 4983936409 = 628332^2 + 70597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399785038633 is a prime.

It is a super-2 number, since 2×399785038633² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (399785038613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199892519316 + 199892519317.

It is an arithmetic number, because the mean of its divisors is an integer number (199892519317).

Almost surely, 2^399785038633 is an apocalyptic number.

It is an amenable number.

399785038633 is a deficient number, since it is larger than the sum of its proper divisors (1).

399785038633 is an equidigital number, since it uses as much as digits as its factorization.

399785038633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88179840, while the sum is 64.

The spelling of 399785038633 in words is "three hundred ninety-nine billion, seven hundred eighty-five million, thirty-eight thousand, six hundred thirty-three".