399039854 has 4 divisors (see below), whose sum is σ = 598559784. Its totient is φ = 199519926.

The previous prime is 399039853. The next prime is 399039863. The reversal of 399039854 is 458930993.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399039853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99759962 + ... + 99759965.

It is an arithmetic number, because the mean of its divisors is an integer number (149639946).

Almost surely, 2^399039854 is an apocalyptic number.

399039854 is a deficient number, since it is larger than the sum of its proper divisors (199519930).

399039854 is a wasteful number, since it uses less digits than its factorization.

399039854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199519929.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The square root of 399039854 is about 19975.9819283058. The cubic root of 399039854 is about 736.2162927140.

The spelling of 399039854 in words is "three hundred ninety-nine million, thirty-nine thousand, eight hundred fifty-four".