163987974 has 24 divisors (see below), whose sum is σ = 374008440. Its totient is φ = 51785568.

The previous prime is 163987949. The next prime is 163987981. The reversal of 163987974 is 479789361.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 163987974.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239407 + ... + 240090.

It is an arithmetic number, because the mean of its divisors is an integer number (15583685).

Almost surely, 2^163987974 is an apocalyptic number.

163987974 is an abundant number, since it is smaller than the sum of its proper divisors (210020466).

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

163987974 is a wasteful number, since it uses less digits than its factorization.

163987974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479524 (or 479521 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 163987974 is about 12805.7789298426. The cubic root of 163987974 is about 547.3569877300.

The spelling of 163987974 in words is "one hundred sixty-three million, nine hundred eighty-seven thousand, nine hundred seventy-four".