19912495 has 4 divisors (see below), whose sum is σ = 23895000. Its totient is φ = 15929992.

The previous prime is 19912493. The next prime is 19912499. The reversal of 19912495 is 59421991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19912495 - 2¹ = 19912493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19912493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1991245 + ... + 1991254.

It is an arithmetic number, because the mean of its divisors is an integer number (5973750).

Almost surely, 2^19912495 is an apocalyptic number.

19912495 is a deficient number, since it is larger than the sum of its proper divisors (3982505).

19912495 is an equidigital number, since it uses as much as digits as its factorization.

19912495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982504.

The product of its digits is 29160, while the sum is 40.

The square root of 19912495 is about 4462.3418739491. The cubic root of 19912495 is about 271.0453077118.

The spelling of 19912495 in words is "nineteen million, nine hundred twelve thousand, four hundred ninety-five".