399012143 has 4 divisors (see below), whose sum is σ = 406540728. Its totient is φ = 391483560.

The previous prime is 399012137. The next prime is 399012157. The reversal of 399012143 is 341210993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341210993 = 2089 ⋅163337.

It is a cyclic number.

It is not a de Polignac number, because 399012143 - 2⁸ = 399011887 is a prime.

It is a super-2 number, since 2×399012143² = 318421380522904898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399012113) 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, 3764213 + ... + 3764318.

It is an arithmetic number, because the mean of its divisors is an integer number (101635182).

Almost surely, 2^399012143 is an apocalyptic number.

399012143 is a deficient number, since it is larger than the sum of its proper divisors (7528585).

399012143 is an equidigital number, since it uses as much as digits as its factorization.

399012143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7528584.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 399012143 is about 19975.2883083073. The cubic root of 399012143 is about 736.1992503378.

The spelling of 399012143 in words is "three hundred ninety-nine million, twelve thousand, one hundred forty-three".