163953820 has 24 divisors (see below), whose sum is σ = 356176800. Its totient is φ = 63319872.

The previous prime is 163953809. The next prime is 163953851. The reversal of 163953820 is 28359361.

It is a self number, because there is not a number n which added to its sum of digits gives 163953820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140760 + ... + 141919.

It is an arithmetic number, because the mean of its divisors is an integer number (14840700).

Almost surely, 2^163953820 is an apocalyptic number.

163953820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163953820 is an abundant number, since it is smaller than the sum of its proper divisors (192222980).

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

163953820 is a wasteful number, since it uses less digits than its factorization.

163953820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282717 (or 282715 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 163953820 is about 12804.4453218404. The cubic root of 163953820 is about 547.3189854950.

The spelling of 163953820 in words is "one hundred sixty-three million, nine hundred fifty-three thousand, eight hundred twenty".