19308897 has 6 divisors (see below), whose sum is σ = 27890642. Its totient is φ = 12872592.

The previous prime is 19308893. The next prime is 19308911. The reversal of 19308897 is 79880391.

It can be written as a sum of positive squares in only one way, i.e., 16353936 + 2954961 = 4044^2 + 1719^2 .

It is not a de Polignac number, because 19308897 - 2² = 19308893 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (19308893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1072708 + ... + 1072725.

Almost surely, 2^19308897 is an apocalyptic number.

It is an amenable number.

19308897 is a deficient number, since it is larger than the sum of its proper divisors (8581745).

19308897 is a wasteful number, since it uses less digits than its factorization.

19308897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145439 (or 2145436 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 19308897 is about 4394.1890036729. The cubic root of 19308897 is about 268.2784706667.

The spelling of 19308897 in words is "nineteen million, three hundred eight thousand, eight hundred ninety-seven".