19897494 has 16 divisors (see below), whose sum is σ = 39841200. Its totient is φ = 6624800.

The previous prime is 19897489. The next prime is 19897543. The reversal of 19897494 is 49479891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6532 + ... + 9080.

It is an arithmetic number, because the mean of its divisors is an integer number (2490075).

Almost surely, 2^19897494 is an apocalyptic number.

19897494 is an abundant number, since it is smaller than the sum of its proper divisors (19943706).

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

19897494 is a wasteful number, since it uses less digits than its factorization.

19897494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855.

The product of its digits is 653184, while the sum is 51.

The square root of 19897494 is about 4460.6607133921. The cubic root of 19897494 is about 270.9772269730.

The spelling of 19897494 in words is "nineteen million, eight hundred ninety-seven thousand, four hundred ninety-four".