393059981 has 2 divisors, whose sum is σ = 393059982. Its totient is φ = 393059980.

The previous prime is 393059971. The next prime is 393060001. The reversal of 393059981 is 189950393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325261225 + 67798756 = 18035^2 + 8234^2 .

It is a cyclic number.

It is not a de Polignac number, because 393059981 - 2¹⁴ = 393043597 is a prime.

It is a super-2 number, since 2×393059981² = 308992297327440722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393059921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196529990 + 196529991.

It is an arithmetic number, because the mean of its divisors is an integer number (196529991).

Almost surely, 2^393059981 is an apocalyptic number.

It is an amenable number.

393059981 is a deficient number, since it is larger than the sum of its proper divisors (1).

393059981 is an equidigital number, since it uses as much as digits as its factorization.

393059981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 393059981 is about 19825.7403644858. The cubic root of 393059981 is about 732.5202072493.

The spelling of 393059981 in words is "three hundred ninety-three million, fifty-nine thousand, nine hundred eighty-one".