385629721 has 2 divisors, whose sum is σ = 385629722. Its totient is φ = 385629720.

The previous prime is 385629709. The next prime is 385629743. The reversal of 385629721 is 127926583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264387600 + 121242121 = 16260^2 + 11011^2 .

It is a cyclic number.

It is not a de Polignac number, because 385629721 - 2⁷ = 385629593 is a prime.

It is not a weakly prime, because it can be changed into another prime (385629781) 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, 192814860 + 192814861.

It is an arithmetic number, because the mean of its divisors is an integer number (192814861).

Almost surely, 2^385629721 is an apocalyptic number.

It is an amenable number.

385629721 is a deficient number, since it is larger than the sum of its proper divisors (1).

385629721 is an equidigital number, since it uses as much as digits as its factorization.

385629721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 43.

The square root of 385629721 is about 19637.4570909779. The cubic root of 385629721 is about 727.8750496267.

The spelling of 385629721 in words is "three hundred eighty-five million, six hundred twenty-nine thousand, seven hundred twenty-one".