393820390 has 8 divisors (see below), whose sum is σ = 708876720. Its totient is φ = 157528152.

The previous prime is 393820381. The next prime is 393820411. The reversal of 393820390 is 93028393.

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 19691010 + ... + 19691029.

It is an arithmetic number, because the mean of its divisors is an integer number (88609590).

Almost surely, 2^393820390 is an apocalyptic number.

393820390 is a deficient number, since it is larger than the sum of its proper divisors (315056330).

393820390 is a wasteful number, since it uses less digits than its factorization.

393820390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39382046.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 393820390 is about 19844.9084150066. The cubic root of 393820390 is about 732.9922778175.

The spelling of 393820390 in words is "three hundred ninety-three million, eight hundred twenty thousand, three hundred ninety".