399240633543 has 4 divisors (see below), whose sum is σ = 532320844728. Its totient is φ = 266160422360.

The previous prime is 399240633469. The next prime is 399240633551. The reversal of 399240633543 is 345336042993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399240633543 - 2¹⁶ = 399240568007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399240633553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66540105588 + ... + 66540105593.

It is an arithmetic number, because the mean of its divisors is an integer number (133080211182).

Almost surely, 2^399240633543 is an apocalyptic number.

399240633543 is a deficient number, since it is larger than the sum of its proper divisors (133080211185).

399240633543 is a wasteful number, since it uses less digits than its factorization.

399240633543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133080211184.

The product of its (nonzero) digits is 6298560, while the sum is 51.

The spelling of 399240633543 in words is "three hundred ninety-nine billion, two hundred forty million, six hundred thirty-three thousand, five hundred forty-three".