19440097815 has 16 divisors (see below), whose sum is σ = 31251574656. Its totient is φ = 10318912800.

The previous prime is 19440097801. The next prime is 19440097819. The reversal of 19440097815 is 51879004491.

It is not a de Polignac number, because 19440097815 - 2⁷ = 19440097687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440097819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3067941 + ... + 3074270.

It is an arithmetic number, because the mean of its divisors is an integer number (1953223416).

Almost surely, 2^19440097815 is an apocalyptic number.

19440097815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19440097815 is a deficient number, since it is larger than the sum of its proper divisors (11811476841).

19440097815 is a wasteful number, since it uses less digits than its factorization.

19440097815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6142430.

The product of its (nonzero) digits is 362880, while the sum is 48.

The spelling of 19440097815 in words is "nineteen billion, four hundred forty million, ninety-seven thousand, eight hundred fifteen".