19421730 has 24 divisors (see below), whose sum is σ = 50496732. Its totient is φ = 5179104.

The previous prime is 19421713. The next prime is 19421749. The reversal of 19421730 is 3712491.

It can be written as a sum of positive squares in 2 ways, for example, as 19421649 + 81 = 4407^2 + 9^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19421694 and 19421703.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107809 + ... + 107988.

Almost surely, 2^19421730 is an apocalyptic number.

19421730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19421730 is an abundant number, since it is smaller than the sum of its proper divisors (31075002).

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

19421730 is a wasteful number, since it uses less digits than its factorization.

19421730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215810 (or 215807 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 19421730 is about 4407.0091899155. The cubic root of 19421730 is about 268.8000245801.

The spelling of 19421730 in words is "nineteen million, four hundred twenty-one thousand, seven hundred thirty".