19442100 has 72 divisors (see below), whose sum is σ = 56697760. Its totient is φ = 5143680.

The previous prime is 19442089. The next prime is 19442117. The reversal of 19442100 is 124491.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68559 + ... + 68841.

Almost surely, 2^19442100 is an apocalyptic number.

19442100 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 19442100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28348880).

19442100 is an abundant number, since it is smaller than the sum of its proper divisors (37255660).

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

19442100 is a wasteful number, since it uses less digits than its factorization.

19442100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529 (or 522 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 19442100 is about 4409.3196754148. The cubic root of 19442100 is about 268.8939664921.

Adding to 19442100 its reverse (124491), we get a palindrome (19566591).

The spelling of 19442100 in words is "nineteen million, four hundred forty-two thousand, one hundred".