19940449305 has 24 divisors (see below), whose sum is σ = 37113653952. Its totient is φ = 9115633632.

The previous prime is 19940449259. The next prime is 19940449307. The reversal of 19940449305 is 50394404991.

It is a happy number.

It is not a de Polignac number, because 19940449305 - 2¹⁸ = 19940187161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19940449307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13564197 + ... + 13565666.

It is an arithmetic number, because the mean of its divisors is an integer number (1546402248).

Almost surely, 2^19940449305 is an apocalyptic number.

19940449305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19940449305 is a deficient number, since it is larger than the sum of its proper divisors (17173204647).

19940449305 is a wasteful number, since it uses less digits than its factorization.

19940449305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27129885 (or 27129878 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 48.

The spelling of 19940449305 in words is "nineteen billion, nine hundred forty million, four hundred forty-nine thousand, three hundred five".