393072881 has 2 divisors, whose sum is σ = 393072882. Its totient is φ = 393072880.

The previous prime is 393072859. The next prime is 393072899. The reversal of 393072881 is 188270393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 270306481 + 122766400 = 16441^2 + 11080^2 .

It is a cyclic number.

It is not a de Polignac number, because 393072881 - 2²² = 388878577 is a prime.

It is a super-2 number, since 2×393072881² = 309012579555280322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (393072821) by changing a digit.

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 as a sum of consecutive naturals, namely, 196536440 + 196536441.

It is an arithmetic number, because the mean of its divisors is an integer number (196536441).

Almost surely, 2^393072881 is an apocalyptic number.

It is an amenable number.

393072881 is a deficient number, since it is larger than the sum of its proper divisors (1).

393072881 is an equidigital number, since it uses as much as digits as its factorization.

393072881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 393072881 is about 19826.0656964512. The cubic root of 393072881 is about 732.5282207907.

The spelling of 393072881 in words is "three hundred ninety-three million, seventy-two thousand, eight hundred eighty-one".