399621143 has 4 divisors (see below), whose sum is σ = 399816360. Its totient is φ = 399425928.

The previous prime is 399621107. The next prime is 399621149. The reversal of 399621143 is 341126993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341126993 = 383 ⋅890671.

It is a cyclic number.

It is not a de Polignac number, because 399621143 - 2¹⁰ = 399620119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399621097 and 399621106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399621149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94505 + ... + 98642.

It is an arithmetic number, because the mean of its divisors is an integer number (99954090).

Almost surely, 2^399621143 is an apocalyptic number.

399621143 is a deficient number, since it is larger than the sum of its proper divisors (195217).

399621143 is a wasteful number, since it uses less digits than its factorization.

399621143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195216.

The product of its digits is 34992, while the sum is 38.

The square root of 399621143 is about 19990.5263312400. The cubic root of 399621143 is about 736.5736060610.

The spelling of 399621143 in words is "three hundred ninety-nine million, six hundred twenty-one thousand, one hundred forty-three".