163903956 has 48 divisors (see below), whose sum is σ = 404597760. Its totient is φ = 51498720.

The previous prime is 163903951. The next prime is 163903973. The reversal of 163903956 is 659309361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163903951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46405 + ... + 49811.

It is an arithmetic number, because the mean of its divisors is an integer number (8429120).

Almost surely, 2^163903956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163903956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202298880).

163903956 is an abundant number, since it is smaller than the sum of its proper divisors (240693804).

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

163903956 is a wasteful number, since it uses less digits than its factorization.

163903956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3644 (or 3642 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 42.

The square root of 163903956 is about 12802.4980374925. The cubic root of 163903956 is about 547.2634936882.

The spelling of 163903956 in words is "one hundred sixty-three million, nine hundred three thousand, nine hundred fifty-six".