100443420 has 144 divisors (see below), whose sum is σ = 379911168. Its totient is φ = 20868480.

The previous prime is 100443407. The next prime is 100443439. The reversal of 100443420 is 24344001.

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

It is a junction number, because it is equal to n+sod(n) for n = 100443393 and 100443402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10237 + ... + 17483.

It is an arithmetic number, because the mean of its divisors is an integer number (2638272).

Almost surely, 2^100443420 is an apocalyptic number.

100443420 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 100443420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189955584).

100443420 is an abundant number, since it is smaller than the sum of its proper divisors (279467748).

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

100443420 is a wasteful number, since it uses less digits than its factorization.

100443420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7280 (or 7275 counting only the distinct ones).

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

The square root of 100443420 is about 10022.1464766785. The cubic root of 100443420 is about 464.8439295864.

Adding to 100443420 its reverse (24344001), we get a palindrome (124787421).

The spelling of 100443420 in words is "one hundred million, four hundred forty-three thousand, four hundred twenty".