399208471 has 2 divisors, whose sum is σ = 399208472. Its totient is φ = 399208470.

The previous prime is 399208451. The next prime is 399208477. The reversal of 399208471 is 174802993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399208471 is a prime.

It is a super-3 number, since 3×399208471³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399208477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199604235 + 199604236.

It is an arithmetic number, because the mean of its divisors is an integer number (199604236).

Almost surely, 2^399208471 is an apocalyptic number.

399208471 is a deficient number, since it is larger than the sum of its proper divisors (1).

399208471 is an equidigital number, since it uses as much as digits as its factorization.

399208471 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 43.

The square root of 399208471 is about 19980.2019759561. The cubic root of 399208471 is about 736.3199758426.

The spelling of 399208471 in words is "three hundred ninety-nine million, two hundred eight thousand, four hundred seventy-one".