163400985 has 24 divisors (see below), whose sum is σ = 308977344. Its totient is φ = 79224480.

The previous prime is 163400981. The next prime is 163401013. The reversal of 163400985 is 589004361.

163400985 is a `hidden beast` number, since 163 + 400 + 98 + 5 = 666.

It is not a de Polignac number, because 163400985 - 2² = 163400981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163400981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164557 + ... + 165546.

It is an arithmetic number, because the mean of its divisors is an integer number (12874056).

Almost surely, 2^163400985 is an apocalyptic number.

163400985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163400985 is a deficient number, since it is larger than the sum of its proper divisors (145576359).

163400985 is a wasteful number, since it uses less digits than its factorization.

163400985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330125 (or 330122 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 163400985 is about 12782.8394732939. The cubic root of 163400985 is about 546.7031254602.

The spelling of 163400985 in words is "one hundred sixty-three million, four hundred thousand, nine hundred eighty-five".