19987417 has 4 divisors (see below), whose sum is σ = 20119936. Its totient is φ = 19854900.

The previous prime is 19987403. The next prime is 19987433. The reversal of 19987417 is 71478991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71478991 = 1627 ⋅43933.

It is a cyclic number.

It is not a de Polignac number, because 19987417 - 2²³ = 11598809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19987477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66033 + ... + 66334.

It is an arithmetic number, because the mean of its divisors is an integer number (5029984).

Almost surely, 2^19987417 is an apocalyptic number.

It is an amenable number.

19987417 is a deficient number, since it is larger than the sum of its proper divisors (132519).

19987417 is a wasteful number, since it uses less digits than its factorization.

19987417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132518.

The product of its digits is 127008, while the sum is 46.

The square root of 19987417 is about 4470.7289114864. The cubic root of 19987417 is about 271.3848238556.

It can be divided in two parts, 199 and 87417, that added together give a square (87616 = 296²).

The spelling of 19987417 in words is "nineteen million, nine hundred eighty-seven thousand, four hundred seventeen".