399826093 has 2 divisors, whose sum is σ = 399826094. Its totient is φ = 399826092.

The previous prime is 399826087. The next prime is 399826109. The reversal of 399826093 is 390628993.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396089604 + 3736489 = 19902^2 + 1933^2 .

It is an emirp because it is prime and its reverse (390628993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399826093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399826073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199913046 + 199913047.

It is an arithmetic number, because the mean of its divisors is an integer number (199913047).

Almost surely, 2^399826093 is an apocalyptic number.

It is an amenable number.

399826093 is a deficient number, since it is larger than the sum of its proper divisors (1).

399826093 is an equidigital number, since it uses as much as digits as its factorization.

399826093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 399826093 is about 19995.6518523403. The cubic root of 399826093 is about 736.6995044386.

The spelling of 399826093 in words is "three hundred ninety-nine million, eight hundred twenty-six thousand, ninety-three".