399183889 has 4 divisors (see below), whose sum is σ = 429890356. Its totient is φ = 368477424.

The previous prime is 399183881. The next prime is 399183907. The reversal of 399183889 is 988381993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988381993 = 401 ⋅2464793.

It can be written as a sum of positive squares in 2 ways, for example, as 104203264 + 294980625 = 10208^2 + 17175^2 .

It is a cyclic number.

It is not a de Polignac number, because 399183889 - 2³ = 399183881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399183881) 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, 15353214 + ... + 15353239.

It is an arithmetic number, because the mean of its divisors is an integer number (107472589).

Almost surely, 2^399183889 is an apocalyptic number.

It is an amenable number.

399183889 is a deficient number, since it is larger than the sum of its proper divisors (30706467).

399183889 is a wasteful number, since it uses less digits than its factorization.

399183889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30706466.

The product of its digits is 3359232, while the sum is 58.

The square root of 399183889 is about 19979.5868075393. The cubic root of 399183889 is about 736.3048621109.

The spelling of 399183889 in words is "three hundred ninety-nine million, one hundred eighty-three thousand, eight hundred eighty-nine".