163891974 has 16 divisors (see below), whose sum is σ = 342035712. Its totient is φ = 52255368.

The previous prime is 163891969. The next prime is 163891979. The reversal of 163891974 is 479198361.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (163891969) and next prime (163891979).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163891979) 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, 593674 + ... + 593949.

It is an arithmetic number, because the mean of its divisors is an integer number (21377232).

Almost surely, 2^163891974 is an apocalyptic number.

163891974 is an abundant number, since it is smaller than the sum of its proper divisors (178143738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163891974 is a wasteful number, since it uses less digits than its factorization.

163891974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187651.

The product of its digits is 326592, while the sum is 48.

The square root of 163891974 is about 12802.0300733907. The cubic root of 163891974 is about 547.2501576851.

The spelling of 163891974 in words is "one hundred sixty-three million, eight hundred ninety-one thousand, nine hundred seventy-four".