19445893427 has 4 divisors (see below), whose sum is σ = 19446245280. Its totient is φ = 19445541576.

The previous prime is 19445893399. The next prime is 19445893451. The reversal of 19445893427 is 72439854491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72439854491 = 479 ⋅151231429.

It is a cyclic number.

It is not a de Polignac number, because 19445893427 - 2⁸ = 19445893171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19445893477) 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, 72923 + ... + 210260.

It is an arithmetic number, because the mean of its divisors is an integer number (4861561320).

Almost surely, 2^19445893427 is an apocalyptic number.

19445893427 is a deficient number, since it is larger than the sum of its proper divisors (351853).

19445893427 is an equidigital number, since it uses as much as digits as its factorization.

19445893427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351852.

The product of its digits is 8709120, while the sum is 56.

The spelling of 19445893427 in words is "nineteen billion, four hundred forty-five million, eight hundred ninety-three thousand, four hundred twenty-seven".