19698494 has 4 divisors (see below), whose sum is σ = 29547744. Its totient is φ = 9849246.

The previous prime is 19698493. The next prime is 19698509. The reversal of 19698494 is 49489691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49489691 = 97 ⋅510203.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19698493) 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, 4924622 + ... + 4924625.

It is an arithmetic number, because the mean of its divisors is an integer number (7386936).

Almost surely, 2^19698494 is an apocalyptic number.

19698494 is a deficient number, since it is larger than the sum of its proper divisors (9849250).

19698494 is an equidigital number, since it uses as much as digits as its factorization.

19698494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9849249.

The product of its digits is 559872, while the sum is 50.

The square root of 19698494 is about 4438.2985478672. The cubic root of 19698494 is about 270.0708273263.

The spelling of 19698494 in words is "nineteen million, six hundred ninety-eight thousand, four hundred ninety-four".