385504021 has 12 divisors (see below), whose sum is σ = 454590732. Its totient is φ = 325902528.

The previous prime is 385504013. The next prime is 385504027. The reversal of 385504021 is 120405583.

It can be written as a sum of positive squares in 2 ways, for example, as 103734225 + 281769796 = 10185^2 + 16786^2 .

It is not a de Polignac number, because 385504021 - 2³ = 385504013 is a prime.

It is a super-2 number, since 2×385504021² = 297226700414336882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385504027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50310 + ... + 57463.

It is an arithmetic number, because the mean of its divisors is an integer number (37882561).

Almost surely, 2^385504021 is an apocalyptic number.

It is an amenable number.

385504021 is a deficient number, since it is larger than the sum of its proper divisors (69086711).

385504021 is a wasteful number, since it uses less digits than its factorization.

385504021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107860 (or 107853 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 385504021 is about 19634.2563139020. The cubic root of 385504021 is about 727.7959548961.

The spelling of 385504021 in words is "three hundred eighty-five million, five hundred four thousand, twenty-one".