163878399 has 6 divisors (see below), whose sum is σ = 236713256. Its totient is φ = 109252260.

The previous prime is 163878397. The next prime is 163878409. The reversal of 163878399 is 993878361.

It is not a de Polignac number, because 163878399 - 2¹ = 163878397 is a prime.

It is a super-2 number, since 2×163878399² = 53712259317606402, 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 (163878397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9104347 + ... + 9104364.

Almost surely, 2^163878399 is an apocalyptic number.

163878399 is a deficient number, since it is larger than the sum of its proper divisors (72834857).

163878399 is a wasteful number, since it uses less digits than its factorization.

163878399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18208717 (or 18208714 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 163878399 is about 12801.4998730617. The cubic root of 163878399 is about 547.2350478828.

The spelling of 163878399 in words is "one hundred sixty-three million, eight hundred seventy-eight thousand, three hundred ninety-nine".