399026623 has 2 divisors, whose sum is σ = 399026624. Its totient is φ = 399026622.

The previous prime is 399026599. The next prime is 399026651. The reversal of 399026623 is 326620993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399026623 - 2⁵ = 399026591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399026653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199513311 + 199513312.

It is an arithmetic number, because the mean of its divisors is an integer number (199513312).

Almost surely, 2^399026623 is an apocalyptic number.

399026623 is a deficient number, since it is larger than the sum of its proper divisors (1).

399026623 is an equidigital number, since it uses as much as digits as its factorization.

399026623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 399026623 is about 19975.6507528541. The cubic root of 399026623 is about 736.2081556943.

The spelling of 399026623 in words is "three hundred ninety-nine million, twenty-six thousand, six hundred twenty-three".