366447821 has 2 divisors, whose sum is σ = 366447822. Its totient is φ = 366447820.

The previous prime is 366447811. The next prime is 366447833. The reversal of 366447821 is 128744663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236236900 + 130210921 = 15370^2 + 11411^2 .

It is an emirp because it is prime and its reverse (128744663) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 366447821 - 2²² = 362253517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (366447811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 183223910 + 183223911.

It is an arithmetic number, because the mean of its divisors is an integer number (183223911).

Almost surely, 2^366447821 is an apocalyptic number.

It is an amenable number.

366447821 is a deficient number, since it is larger than the sum of its proper divisors (1).

366447821 is an equidigital number, since it uses as much as digits as its factorization.

366447821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 41.

The square root of 366447821 is about 19142.8268811061. The cubic root of 366447821 is about 715.6006304853.

The spelling of 366447821 in words is "three hundred sixty-six million, four hundred forty-seven thousand, eight hundred twenty-one".