19690738 has 4 divisors (see below), whose sum is σ = 29536110. Its totient is φ = 9845368.

The previous prime is 19690733. The next prime is 19690751. The reversal of 19690738 is 83709691.

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., 18774889 + 915849 = 4333^2 + 957^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19690694 and 19690703.

It is not an unprimeable number, because it can be changed into a prime (19690733) 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, 4922683 + ... + 4922686.

Almost surely, 2^19690738 is an apocalyptic number.

19690738 is a deficient number, since it is larger than the sum of its proper divisors (9845372).

19690738 is an equidigital number, since it uses as much as digits as its factorization.

19690738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9845371.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 19690738 is about 4437.4247035865. The cubic root of 19690738 is about 270.0353771660.

The spelling of 19690738 in words is "nineteen million, six hundred ninety thousand, seven hundred thirty-eight".