399129236943 has 4 divisors (see below), whose sum is σ = 532172315928. Its totient is φ = 266086157960.

The previous prime is 399129236927. The next prime is 399129236951. The reversal of 399129236943 is 349632921993.

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 399129236943 - 2⁴ = 399129236927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399129236963) 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, 66521539488 + ... + 66521539493.

It is an arithmetic number, because the mean of its divisors is an integer number (133043078982).

Almost surely, 2^399129236943 is an apocalyptic number.

399129236943 is a deficient number, since it is larger than the sum of its proper divisors (133043078985).

399129236943 is a wasteful number, since it uses less digits than its factorization.

399129236943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133043078984.

The product of its digits is 17006112, while the sum is 60.

The spelling of 399129236943 in words is "three hundred ninety-nine billion, one hundred twenty-nine million, two hundred thirty-six thousand, nine hundred forty-three".