19421697 has 8 divisors (see below), whose sum is σ = 25917856. Its totient is φ = 12936672.

The previous prime is 19421687. The next prime is 19421711. The reversal of 19421697 is 79612491.

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

It is not a de Polignac number, because 19421697 - 2⁷ = 19421569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19421617) 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, 3018 + ... + 6924.

It is an arithmetic number, because the mean of its divisors is an integer number (3239732).

Almost surely, 2^19421697 is an apocalyptic number.

It is an amenable number.

19421697 is a deficient number, since it is larger than the sum of its proper divisors (6496159).

19421697 is a wasteful number, since it uses less digits than its factorization.

19421697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5567.

The product of its digits is 27216, while the sum is 39.

The square root of 19421697 is about 4407.0054458782. The cubic root of 19421697 is about 268.7998723382.

The spelling of 19421697 in words is "nineteen million, four hundred twenty-one thousand, six hundred ninety-seven".