163878401 has 8 divisors (see below), whose sum is σ = 172629600. Its totient is φ = 155139840.

The previous prime is 163878397. The next prime is 163878409. The reversal of 163878401 is 104878361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163878401 - 2² = 163878397 is a prime.

It is a super-2 number, since 2×163878401² = 53712260628633602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163878409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36065 + ... + 40353.

It is an arithmetic number, because the mean of its divisors is an integer number (21578700).

Almost surely, 2^163878401 is an apocalyptic number.

It is an amenable number.

163878401 is a deficient number, since it is larger than the sum of its proper divisors (8751199).

163878401 is a wasteful number, since it uses less digits than its factorization.

163878401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 163878401 is about 12801.4999511776. The cubic root of 163878401 is about 547.2350501089.

The spelling of 163878401 in words is "one hundred sixty-three million, eight hundred seventy-eight thousand, four hundred one".