399505283 has 4 divisors (see below), whose sum is σ = 399893808. Its totient is φ = 399116760.

The previous prime is 399505259. The next prime is 399505319. The reversal of 399505283 is 382505993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 382505993 = 31 ⋅12338903.

It is a cyclic number.

It is not a de Polignac number, because 399505283 - 2⁸ = 399505027 is a prime.

It is a super-2 number, since 2×399505283² = 319208942289820178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399505213) 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, 192716 + ... + 194777.

It is an arithmetic number, because the mean of its divisors is an integer number (99973452).

Almost surely, 2^399505283 is an apocalyptic number.

399505283 is a deficient number, since it is larger than the sum of its proper divisors (388525).

399505283 is a wasteful number, since it uses less digits than its factorization.

399505283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388524.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 399505283 is about 19987.6282484941. The cubic root of 399505283 is about 736.5024155779.

The spelling of 399505283 in words is "three hundred ninety-nine million, five hundred five thousand, two hundred eighty-three".