19417900639 has 4 divisors (see below), whose sum is σ = 19525182040. Its totient is φ = 19310619240.

The previous prime is 19417900613. The next prime is 19417900657. The reversal of 19417900639 is 93600971491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93600971491 = 51109 ⋅1831399.

It is a cyclic number.

It is not a de Polignac number, because 19417900639 - 2²⁷ = 19283682911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19417900592 and 19417900601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19417900609) 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, 53640429 + ... + 53640790.

It is an arithmetic number, because the mean of its divisors is an integer number (4881295510).

Almost surely, 2^19417900639 is an apocalyptic number.

19417900639 is a deficient number, since it is larger than the sum of its proper divisors (107281401).

19417900639 is a wasteful number, since it uses less digits than its factorization.

19417900639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107281400.

The product of its (nonzero) digits is 367416, while the sum is 49.

The spelling of 19417900639 in words is "nineteen billion, four hundred seventeen million, nine hundred thousand, six hundred thirty-nine".