385509015 has 24 divisors (see below), whose sum is σ = 680827680. Its totient is φ = 201724224.

The previous prime is 385509013. The next prime is 385509043. The reversal of 385509015 is 510905583.

It is a happy number.

385509015 is a `hidden beast` number, since 3 + 8 + 550 + 90 + 15 = 666.

It is not a de Polignac number, because 385509015 - 2¹ = 385509013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385509013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78435 + ... + 83204.

It is an arithmetic number, because the mean of its divisors is an integer number (28367820).

Almost surely, 2^385509015 is an apocalyptic number.

385509015 is a deficient number, since it is larger than the sum of its proper divisors (295318665).

385509015 is a wasteful number, since it uses less digits than its factorization.

385509015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161703 (or 161700 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 385509015 is about 19634.3834891753. The cubic root of 385509015 is about 727.7990976193.

The spelling of 385509015 in words is "three hundred eighty-five million, five hundred nine thousand, fifteen".