393949477 has 16 divisors (see below), whose sum is σ = 424906560. Its totient is φ = 364096512.

The previous prime is 393949411. The next prime is 393949489. The reversal of 393949477 is 774949393.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 393949477 - 2¹¹ = 393947429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393949877) 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, 193338 + ... + 195364.

It is an arithmetic number, because the mean of its divisors is an integer number (26556660).

Almost surely, 2^393949477 is an apocalyptic number.

It is an amenable number.

393949477 is a deficient number, since it is larger than the sum of its proper divisors (30957083).

393949477 is a wasteful number, since it uses less digits than its factorization.

393949477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292.

The product of its digits is 5143824, while the sum is 55.

The square root of 393949477 is about 19848.1605444938. The cubic root of 393949477 is about 733.0723561478.

The spelling of 393949477 in words is "three hundred ninety-three million, nine hundred forty-nine thousand, four hundred seventy-seven".