243591972 has 48 divisors (see below), whose sum is σ = 615556032. Its totient is φ = 74528640.

The previous prime is 243591949. The next prime is 243591991. The reversal of 243591972 is 279195342.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23923 + ... + 32549.

It is an arithmetic number, because the mean of its divisors is an integer number (12824084).

Almost surely, 2^243591972 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 243591972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307778016).

243591972 is an abundant number, since it is smaller than the sum of its proper divisors (371964060).

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

243591972 is a wasteful number, since it uses less digits than its factorization.

243591972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8828 (or 8826 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 243591972 is about 15607.4332290739. The cubic root of 243591972 is about 624.5314649543.

The spelling of 243591972 in words is "two hundred forty-three million, five hundred ninety-one thousand, nine hundred seventy-two".