393979 has 8 divisors (see below), whose sum is σ = 414720. Its totient is φ = 373800.

The previous prime is 393977. The next prime is 393989. The reversal of 393979 is 979393.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 393979 - 2¹ = 393977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2112 + ... + 2290.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2³⁹³⁹⁷⁹ is an apocalyptic number.

393979 is a deficient number, since it is larger than the sum of its proper divisors (20741).

393979 is a wasteful number, since it uses less digits than its factorization.

393979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281.

The product of its digits is 45927, while the sum is 40.

The square root of 393979 is about 627.6774649452. The cubic root of 393979 is about 73.3090668102.

The spelling of 393979 in words is "three hundred ninety-three thousand, nine hundred seventy-nine".