393955481 has 4 divisors (see below), whose sum is σ = 414690000. Its totient is φ = 373220964.

The previous prime is 393955453. The next prime is 393955483. The reversal of 393955481 is 184559393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 184559393 = 29 ⋅6364117.

It is a cyclic number.

It is not a de Polignac number, because 393955481 - 2¹⁴ = 393939097 is a prime.

It is a super-2 number, since 2×393955481² = 310401842019882722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393955483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10367231 + ... + 10367268.

It is an arithmetic number, because the mean of its divisors is an integer number (103672500).

Almost surely, 2^393955481 is an apocalyptic number.

It is an amenable number.

393955481 is a deficient number, since it is larger than the sum of its proper divisors (20734519).

393955481 is a wasteful number, since it uses less digits than its factorization.

393955481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20734518.

The product of its digits is 583200, while the sum is 47.

The square root of 393955481 is about 19848.3117921903. The cubic root of 393955481 is about 733.0760802667.

The spelling of 393955481 in words is "three hundred ninety-three million, nine hundred fifty-five thousand, four hundred eighty-one".