393002021 has 2 divisors, whose sum is σ = 393002022. Its totient is φ = 393002020.

The previous prime is 393001993. The next prime is 393002083. The reversal of 393002021 is 120200393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318801025 + 74200996 = 17855^2 + 8614^2 .

It is an emirp because it is prime and its reverse (120200393) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-393002021 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 393001984 and 393002002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393002521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196501010 + 196501011.

It is an arithmetic number, because the mean of its divisors is an integer number (196501011).

Almost surely, 2^393002021 is an apocalyptic number.

It is an amenable number.

393002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

393002021 is an equidigital number, since it uses as much as digits as its factorization.

393002021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 393002021 is about 19824.2785745156. The cubic root of 393002021 is about 732.4842000576.

The spelling of 393002021 in words is "three hundred ninety-three million, two thousand, twenty-one".