385121615 has 16 divisors (see below), whose sum is σ = 472016160. Its totient is φ = 301562880.

The previous prime is 385121573. The next prime is 385121629. The reversal of 385121615 is 516121583.

It is not a de Polignac number, because 385121615 - 2⁶ = 385121551 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68387 + ... + 73803.

It is an arithmetic number, because the mean of its divisors is an integer number (29501010).

Almost surely, 2^385121615 is an apocalyptic number.

385121615 is a deficient number, since it is larger than the sum of its proper divisors (86894545).

385121615 is a wasteful number, since it uses less digits than its factorization.

385121615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5722.

The product of its digits is 7200, while the sum is 32.

The square root of 385121615 is about 19624.5156628132. The cubic root of 385121615 is about 727.5552262213. Note that the first 3 decimals are identical.

Subtracting from 385121615 its sum of digits (32), we obtain a palindrome (385121583).

The spelling of 385121615 in words is "three hundred eighty-five million, one hundred twenty-one thousand, six hundred fifteen".