19987425 has 24 divisors (see below), whose sum is σ = 36718880. Its totient is φ = 10659600.

The previous prime is 19987403. The next prime is 19987433. The reversal of 19987425 is 52478991.

It is not a de Polignac number, because 19987425 - 2⁸ = 19987169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14131 + ... + 15480.

Almost surely, 2^19987425 is an apocalyptic number.

19987425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19987425 is a deficient number, since it is larger than the sum of its proper divisors (16731455).

19987425 is a wasteful number, since it uses less digits than its factorization.

19987425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29630 (or 29619 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 19987425 is about 4470.7298061950. The cubic root of 19987425 is about 271.3848600630.

The spelling of 19987425 in words is "nineteen million, nine hundred eighty-seven thousand, four hundred twenty-five".