163840815 has 48 divisors (see below), whose sum is σ = 305712576. Its totient is φ = 80870400.

The previous prime is 163840813. The next prime is 163840823. The reversal of 163840815 is 518048361.

163840815 is a `hidden beast` number, since 1 + 638 + 4 + 0 + 8 + 15 = 666.

It is not a de Polignac number, because 163840815 - 2¹ = 163840813 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 163840815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163840811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44910 + ... + 48420.

It is an arithmetic number, because the mean of its divisors is an integer number (6369012).

Almost surely, 2^163840815 is an apocalyptic number.

163840815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

163840815 is a deficient number, since it is larger than the sum of its proper divisors (141871761).

163840815 is a wasteful number, since it uses less digits than its factorization.

163840815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600 (or 3597 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 163840815 is about 12800.0318358979. The cubic root of 163840815 is about 547.1932102465.

The spelling of 163840815 in words is "one hundred sixty-three million, eight hundred forty thousand, eight hundred fifteen".