380821993 has 2 divisors, whose sum is σ = 380821994. Its totient is φ = 380821992.

The previous prime is 380821943. The next prime is 380822023. The reversal of 380821993 is 399128083.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 327356649 + 53465344 = 18093^2 + 7312^2 .

It is a cyclic number.

It is not a de Polignac number, because 380821993 - 2¹³ = 380813801 is a prime.

It is not a weakly prime, because it can be changed into another prime (380821933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190410996 + 190410997.

It is an arithmetic number, because the mean of its divisors is an integer number (190410997).

Almost surely, 2^380821993 is an apocalyptic number.

It is an amenable number.

380821993 is a deficient number, since it is larger than the sum of its proper divisors (1).

380821993 is an equidigital number, since it uses as much as digits as its factorization.

380821993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 380821993 is about 19514.6609757895. The cubic root of 380821993 is about 724.8375334724.

The spelling of 380821993 in words is "three hundred eighty million, eight hundred twenty-one thousand, nine hundred ninety-three".