240721998 has 64 divisors (see below), whose sum is σ = 542640384. Its totient is φ = 71148000.

The previous prime is 240721997. The next prime is 240722017. The reversal of 240721998 is 899127042.

It is a super-2 number, since 2×240721998² = 115894160642224008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240721997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 343048 + ... + 343748.

It is an arithmetic number, because the mean of its divisors is an integer number (8478756).

Almost surely, 2^240721998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 240721998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271320192).

240721998 is an abundant number, since it is smaller than the sum of its proper divisors (301918386).

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

240721998 is a wasteful number, since it uses less digits than its factorization.

240721998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 240721998 is about 15515.2182711040. The cubic root of 240721998 is about 622.0690483480.

The spelling of 240721998 in words is "two hundred forty million, seven hundred twenty-one thousand, nine hundred ninety-eight".