19872497 has 2 divisors, whose sum is σ = 19872498. Its totient is φ = 19872496.

The previous prime is 19872491. The next prime is 19872551. The reversal of 19872497 is 79427891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16900321 + 2972176 = 4111^2 + 1724^2 .

It is an emirp because it is prime and its reverse (79427891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19872497 - 2⁴ = 19872481 is a prime.

It is a super-2 number, since 2×19872497² = 789832274030018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19872491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9936248 + 9936249.

It is an arithmetic number, because the mean of its divisors is an integer number (9936249).

Almost surely, 2^19872497 is an apocalyptic number.

It is an amenable number.

19872497 is a deficient number, since it is larger than the sum of its proper divisors (1).

19872497 is an equidigital number, since it uses as much as digits as its factorization.

19872497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 19872497 is about 4457.8578936525. The cubic root of 19872497 is about 270.8637041970.

The spelling of 19872497 in words is "nineteen million, eight hundred seventy-two thousand, four hundred ninety-seven".