19642426 has 4 divisors (see below), whose sum is σ = 29463642. Its totient is φ = 9821212.

The previous prime is 19642421. The next prime is 19642439. The reversal of 19642426 is 62424691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15015625 + 4626801 = 3875^2 + 2151^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19642391 and 19642400.

It is not an unprimeable number, because it can be changed into a prime (19642421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4910605 + ... + 4910608.

Almost surely, 2^19642426 is an apocalyptic number.

19642426 is a deficient number, since it is larger than the sum of its proper divisors (9821216).

19642426 is an equidigital number, since it uses as much as digits as its factorization.

19642426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9821215.

The product of its digits is 20736, while the sum is 34.

The square root of 19642426 is about 4431.9776623986. The cubic root of 19642426 is about 269.8143488278.

The spelling of 19642426 in words is "nineteen million, six hundred forty-two thousand, four hundred twenty-six".