399389747871 has 16 divisors (see below), whose sum is σ = 542071572224. Its totient is φ = 261507464064.

The previous prime is 399389747863. The next prime is 399389747879. The reversal of 399389747871 is 178747983993.

It is an interprime number because it is at equal distance from previous prime (399389747863) and next prime (399389747879).

It is not a de Polignac number, because 399389747871 - 2³ = 399389747863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399389747793 and 399389747802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399389747879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2880355 + ... + 3015828.

It is an arithmetic number, because the mean of its divisors is an integer number (33879473264).

Almost surely, 2^399389747871 is an apocalyptic number.

399389747871 is a deficient number, since it is larger than the sum of its proper divisors (142681824353).

399389747871 is a wasteful number, since it uses less digits than its factorization.

399389747871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5896590.

The product of its digits is 576108288, while the sum is 75.

The spelling of 399389747871 in words is "three hundred ninety-nine billion, three hundred eighty-nine million, seven hundred forty-seven thousand, eight hundred seventy-one".