393955081 has 16 divisors (see below), whose sum is σ = 435907584. Its totient is φ = 353761344.

The previous prime is 393955031. The next prime is 393955087. The reversal of 393955081 is 180559393.

It is a cyclic number.

It is not a de Polignac number, because 393955081 - 2¹¹ = 393953033 is a prime.

It is a super-2 number, since 2×393955081² = 310401211691433122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393955087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103840 + ... + 107566.

It is an arithmetic number, because the mean of its divisors is an integer number (27244224).

Almost surely, 2^393955081 is an apocalyptic number.

It is an amenable number.

393955081 is a deficient number, since it is larger than the sum of its proper divisors (41952503).

393955081 is a wasteful number, since it uses less digits than its factorization.

393955081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 393955081 is about 19848.3017157640. The cubic root of 393955081 is about 733.0758321587.

The spelling of 393955081 in words is "three hundred ninety-three million, nine hundred fifty-five thousand, eighty-one".