19389389457 has 12 divisors (see below), whose sum is σ = 27462712016. Its totient is φ = 12165890880.

The previous prime is 19389389449. The next prime is 19389389507. The reversal of 19389389457 is 75498398391.

It is not a de Polignac number, because 19389389457 - 2³ = 19389389449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19389389407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11181019 + ... + 11182752.

Almost surely, 2^19389389457 is an apocalyptic number.

19389389457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19389389457 is a deficient number, since it is larger than the sum of its proper divisors (8073322559).

19389389457 is a wasteful number, since it uses less digits than its factorization.

19389389457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22363808 (or 22363791 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 66.

The spelling of 19389389457 in words is "nineteen billion, three hundred eighty-nine million, three hundred eighty-nine thousand, four hundred fifty-seven".