19999417 has 4 divisors (see below), whose sum is σ = 20030976. Its totient is φ = 19967860.

The previous prime is 19999411. The next prime is 19999423. The reversal of 19999417 is 71499991.

It is a happy number.

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.

It is an interprime number because it is at equal distance from previous prime (19999411) and next prime (19999423).

It is a cyclic number.

It is not a de Polignac number, because 19999417 - 2¹⁵ = 19966649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19999411) 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, 14809 + ... + 16102.

It is an arithmetic number, because the mean of its divisors is an integer number (5007744).

Almost surely, 2^19999417 is an apocalyptic number.

It is an amenable number.

19999417 is a deficient number, since it is larger than the sum of its proper divisors (31559).

19999417 is an equidigital number, since it uses as much as digits as its factorization.

19999417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31558.

The product of its digits is 183708, while the sum is 49.

The square root of 19999417 is about 4472.0707731430. The cubic root of 19999417 is about 271.4391241247.

The spelling of 19999417 in words is "nineteen million, nine hundred ninety-nine thousand, four hundred seventeen".