380555821 has 2 divisors, whose sum is σ = 380555822. Its totient is φ = 380555820.

The previous prime is 380555803. The next prime is 380555827. The reversal of 380555821 is 128555083.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375933321 + 4622500 = 19389^2 + 2150^2 .

It is a cyclic number.

It is not a de Polignac number, because 380555821 - 2¹⁷ = 380424749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (380555827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190277910 + 190277911.

It is an arithmetic number, because the mean of its divisors is an integer number (190277911).

Almost surely, 2^380555821 is an apocalyptic number.

It is an amenable number.

380555821 is a deficient number, since it is larger than the sum of its proper divisors (1).

380555821 is an equidigital number, since it uses as much as digits as its factorization.

380555821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48000, while the sum is 37.

The square root of 380555821 is about 19507.8399880663. The cubic root of 380555821 is about 724.6686212893.

The spelling of 380555821 in words is "three hundred eighty million, five hundred fifty-five thousand, eight hundred twenty-one".