19439990465 has 8 divisors (see below), whose sum is σ = 26660558400. Its totient is φ = 13330279152.

The previous prime is 19439990461. The next prime is 19439990473. The reversal of 19439990465 is 56409993491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19439990465 - 2² = 19439990461 is a prime.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277714115 + ... + 277714184.

It is an arithmetic number, because the mean of its divisors is an integer number (3332569800).

Almost surely, 2^19439990465 is an apocalyptic number.

It is an amenable number.

19439990465 is a deficient number, since it is larger than the sum of its proper divisors (7220567935).

19439990465 is an equidigital number, since it uses as much as digits as its factorization.

19439990465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555428311.

The product of its (nonzero) digits is 9447840, while the sum is 59.

The spelling of 19439990465 in words is "nineteen billion, four hundred thirty-nine million, nine hundred ninety thousand, four hundred sixty-five".