382447921 has 2 divisors, whose sum is σ = 382447922. Its totient is φ = 382447920.

The previous prime is 382447907. The next prime is 382447957. The reversal of 382447921 is 129744283.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382007025 + 440896 = 19545^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 382447921 - 2²¹ = 380350769 is a prime.

It is not a weakly prime, because it can be changed into another prime (382447991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191223960 + 191223961.

It is an arithmetic number, because the mean of its divisors is an integer number (191223961).

Almost surely, 2^382447921 is an apocalyptic number.

It is an amenable number.

382447921 is a deficient number, since it is larger than the sum of its proper divisors (1).

382447921 is an equidigital number, since it uses as much as digits as its factorization.

382447921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 382447921 is about 19556.2757446299. The cubic root of 382447921 is about 725.8676388509.

The spelling of 382447921 in words is "three hundred eighty-two million, four hundred forty-seven thousand, nine hundred twenty-one".