19439990464 has 14 divisors (see below), whose sum is σ = 38576231204. Its totient is φ = 9719995200.

The previous prime is 19439990461. The next prime is 19439990473. The reversal of 19439990464 is 46409993491.

It is a junction number, because it is equal to n+sod(n) for n = 19439990399 and 19439990408.

It is not an unprimeable number, because it can be changed into a prime (19439990461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151874862 + ... + 151874989.

It is an arithmetic number, because the mean of its divisors is an integer number (2755445086).

Almost surely, 2^19439990464 is an apocalyptic number.

It is an amenable number.

19439990464 is a deficient number, since it is larger than the sum of its proper divisors (19136240740).

19439990464 is an equidigital number, since it uses as much as digits as its factorization.

19439990464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303749863 (or 303749853 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 58.

The spelling of 19439990464 in words is "nineteen billion, four hundred thirty-nine million, nine hundred ninety thousand, four hundred sixty-four".