399988143 has 12 divisors (see below), whose sum is σ = 578705088. Its totient is φ = 266222880.

The previous prime is 399988129. The next prime is 399988153. The reversal of 399988143 is 341889993.

It is not a de Polignac number, because 399988143 - 2⁶ = 399988079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399988143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399988103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30463 + ... + 41568.

It is an arithmetic number, because the mean of its divisors is an integer number (48225424).

Almost surely, 2^399988143 is an apocalyptic number.

399988143 is a deficient number, since it is larger than the sum of its proper divisors (178716945).

399988143 is a wasteful number, since it uses less digits than its factorization.

399988143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72654 (or 72651 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 399988143 is about 19999.7035728033. The cubic root of 399988143 is about 736.7990193959.

The spelling of 399988143 in words is "three hundred ninety-nine million, nine hundred eighty-eight thousand, one hundred forty-three".