100243440 has 160 divisors (see below), whose sum is σ = 376761600. Its totient is φ = 24295680.

The previous prime is 100243439. The next prime is 100243463. The reversal of 100243440 is 44342001.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21651 + ... + 25869.

It is an arithmetic number, because the mean of its divisors is an integer number (2354760).

Almost surely, 2^100243440 is an apocalyptic number.

100243440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100243440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188380800).

100243440 is an abundant number, since it is smaller than the sum of its proper divisors (276518160).

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

100243440 is a wasteful number, since it uses less digits than its factorization.

100243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4252 (or 4240 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 100243440 is about 10012.1646011240. The cubic root of 100243440 is about 464.5352275974.

Adding to 100243440 its reverse (44342001), we get a palindrome (144585441).

The spelling of 100243440 in words is "one hundred million, two hundred forty-three thousand, four hundred forty".