399199543 has 2 divisors, whose sum is σ = 399199544. Its totient is φ = 399199542.

The previous prime is 399199483. The next prime is 399199553. The reversal of 399199543 is 345991993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399199543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399199553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199599771 + 199599772.

It is an arithmetic number, because the mean of its divisors is an integer number (199599772).

Almost surely, 2^399199543 is an apocalyptic number.

399199543 is a deficient number, since it is larger than the sum of its proper divisors (1).

399199543 is an equidigital number, since it uses as much as digits as its factorization.

399199543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1180980, while the sum is 52.

The square root of 399199543 is about 19979.9785535420. The cubic root of 399199543 is about 736.3144867192.

The spelling of 399199543 in words is "three hundred ninety-nine million, one hundred ninety-nine thousand, five hundred forty-three".