19621040 has 40 divisors (see below), whose sum is σ = 46403280. Its totient is φ = 7713536.

The previous prime is 19621039. The next prime is 19621051. The reversal of 19621040 is 4012691.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 19620997 and 19621015.

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 7 ways as a sum of consecutive naturals, for example, 2642 + ... + 6798.

It is an arithmetic number, because the mean of its divisors is an integer number (1160082).

Almost surely, 2^19621040 is an apocalyptic number.

19621040 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 19621040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23201640).

19621040 is an abundant number, since it is smaller than the sum of its proper divisors (26782240).

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

19621040 is a wasteful number, since it uses less digits than its factorization.

19621040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229 (or 4223 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 19621040 is about 4429.5643126610. The cubic root of 19621040 is about 269.7163917309.

The spelling of 19621040 in words is "nineteen million, six hundred twenty-one thousand, forty".