385715615 has 4 divisors (see below), whose sum is σ = 462858744. Its totient is φ = 308572488.

The previous prime is 385715611. The next prime is 385715651. The reversal of 385715615 is 516517583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 516517583 = 2203 ⋅234461.

It is a cyclic number.

It is not a de Polignac number, because 385715615 - 2² = 385715611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385715611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38571557 + ... + 38571566.

It is an arithmetic number, because the mean of its divisors is an integer number (115714686).

Almost surely, 2^385715615 is an apocalyptic number.

385715615 is a deficient number, since it is larger than the sum of its proper divisors (77143129).

385715615 is an equidigital number, since it uses as much as digits as its factorization.

385715615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77143128.

The product of its digits is 126000, while the sum is 41.

The square root of 385715615 is about 19639.6439631680. The cubic root of 385715615 is about 727.9290871786.

The spelling of 385715615 in words is "three hundred eighty-five million, seven hundred fifteen thousand, six hundred fifteen".