19894421954 has 16 divisors (see below), whose sum is σ = 32966593920. Its totient is φ = 8928450960.

The previous prime is 19894421933. The next prime is 19894421969. The reversal of 19894421954 is 45912449891.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19894421954.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5721629 + ... + 5725104.

It is an arithmetic number, because the mean of its divisors is an integer number (2060412120).

Almost surely, 2^19894421954 is an apocalyptic number.

19894421954 is a deficient number, since it is larger than the sum of its proper divisors (13072171966).

19894421954 is a wasteful number, since it uses less digits than its factorization.

19894421954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11446825.

The product of its digits is 3732480, while the sum is 56.

The spelling of 19894421954 in words is "nineteen billion, eight hundred ninety-four million, four hundred twenty-one thousand, nine hundred fifty-four".