19491484384 has 24 divisors (see below), whose sum is σ = 38376970128. Its totient is φ = 9744952320.

The previous prime is 19491484291. The next prime is 19491484399. The reversal of 19491484384 is 48348419491.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763344 + ... + 788464.

It is an arithmetic number, because the mean of its divisors is an integer number (1599040422).

Almost surely, 2^19491484384 is an apocalyptic number.

It is an amenable number.

19491484384 is a deficient number, since it is larger than the sum of its proper divisors (18885485744).

19491484384 is a wasteful number, since it uses less digits than its factorization.

19491484384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49378 (or 49370 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 55.

The spelling of 19491484384 in words is "nineteen billion, four hundred ninety-one million, four hundred eighty-four thousand, three hundred eighty-four".