19494989 has 8 divisors (see below), whose sum is σ = 20597760. Its totient is φ = 18420976.

The previous prime is 19494949. The next prime is 19495009. The reversal of 19494989 is 98949491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19494989 - 2²⁰ = 18446413 is a prime.

It is a super-2 number, since 2×19494989² = 760109192220242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19494989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19494949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5789 + ... + 8514.

It is an arithmetic number, because the mean of its divisors is an integer number (2574720).

Almost surely, 2^19494989 is an apocalyptic number.

It is an amenable number.

19494989 is a deficient number, since it is larger than the sum of its proper divisors (1102771).

19494989 is a wasteful number, since it uses less digits than its factorization.

19494989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14379.

The product of its digits is 839808, while the sum is 53.

The square root of 19494989 is about 4415.3130126866. The cubic root of 19494989 is about 269.1375728357.

The spelling of 19494989 in words is "nineteen million, four hundred ninety-four thousand, nine hundred eighty-nine".