19825997 has 8 divisors (see below), whose sum is σ = 20304120. Its totient is φ = 19353600.

The previous prime is 19825979. The next prime is 19826033. The reversal of 19825997 is 79952891.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3334276 + 16491721 = 1826^2 + 4061^2 .

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 19825997 - 2¹⁴ = 19809613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19825097) 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, 6029 + ... + 8717.

It is an arithmetic number, because the mean of its divisors is an integer number (2538015).

Almost surely, 2^19825997 is an apocalyptic number.

It is an amenable number.

19825997 is a deficient number, since it is larger than the sum of its proper divisors (478123).

19825997 is a wasteful number, since it uses less digits than its factorization.

19825997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2863.

The product of its digits is 408240, while the sum is 50.

The square root of 19825997 is about 4452.6393296561. The cubic root of 19825997 is about 270.6522729760.

The spelling of 19825997 in words is "nineteen million, eight hundred twenty-five thousand, nine hundred ninety-seven".