19890497 has 8 divisors (see below), whose sum is σ = 22285632. Its totient is φ = 17593200.

The previous prime is 19890463. The next prime is 19890503. The reversal of 19890497 is 79409891.

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 19890497 - 2²⁴ = 3113281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19890797) 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, 24029 + ... + 24842.

It is an arithmetic number, because the mean of its divisors is an integer number (2785704).

Almost surely, 2^19890497 is an apocalyptic number.

It is an amenable number.

19890497 is a deficient number, since it is larger than the sum of its proper divisors (2395135).

19890497 is a wasteful number, since it uses less digits than its factorization.

19890497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48919.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 19890497 is about 4459.8763435773. The cubic root of 19890497 is about 270.9454599919.

The spelling of 19890497 in words is "nineteen million, eight hundred ninety thousand, four hundred ninety-seven".