399385072819 has 4 divisors (see below), whose sum is σ = 401928926944. Its totient is φ = 396841218696.

The previous prime is 399385072799. The next prime is 399385072861. The reversal of 399385072819 is 918270583993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 918270583993 = 7 ⋅131181511999.

It is a cyclic number.

It is not a de Polignac number, because 399385072819 - 2¹³ = 399385064627 is a prime.

It is a super-2 number, since 2×399385072819² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399385072319) 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, 1271926827 + ... + 1271927140.

It is an arithmetic number, because the mean of its divisors is an integer number (100482231736).

Almost surely, 2^399385072819 is an apocalyptic number.

399385072819 is a deficient number, since it is larger than the sum of its proper divisors (2543854125).

399385072819 is a wasteful number, since it uses less digits than its factorization.

399385072819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543854124.

The product of its (nonzero) digits is 29393280, while the sum is 64.

The spelling of 399385072819 in words is "three hundred ninety-nine billion, three hundred eighty-five million, seventy-two thousand, eight hundred nineteen".