399550958 has 4 divisors (see below), whose sum is σ = 599326440. Its totient is φ = 199775478.

The previous prime is 399550927. The next prime is 399550967. The reversal of 399550958 is 859055993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 859055993 = 397 ⋅2163869.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 99887738 + ... + 99887741.

It is an arithmetic number, because the mean of its divisors is an integer number (149831610).

Almost surely, 2^399550958 is an apocalyptic number.

399550958 is a deficient number, since it is larger than the sum of its proper divisors (199775482).

399550958 is a wasteful number, since it uses less digits than its factorization.

399550958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199775481.

The product of its (nonzero) digits is 2187000, while the sum is 53.

The square root of 399550958 is about 19988.7707976254. The cubic root of 399550958 is about 736.5304823456.

The spelling of 399550958 in words is "three hundred ninety-nine million, five hundred fifty thousand, nine hundred fifty-eight".