19499374440 has 384 divisors, whose sum is σ = 80110517760. Its totient is φ = 4002711552.

The previous prime is 19499374439. The next prime is 19499374451. The reversal of 19499374440 is 4447399491.

19499374440 is a `hidden beast` number, since 1 + 9 + 49 + 93 + 74 + 440 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1204077 + ... + 1220163.

It is an arithmetic number, because the mean of its divisors is an integer number (208621140).

Almost surely, 2^19499374440 is an apocalyptic number.

19499374440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19499374440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40055258880).

19499374440 is an abundant number, since it is smaller than the sum of its proper divisors (60611143320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19499374440 is a wasteful number, since it uses less digits than its factorization.

19499374440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16161 (or 16154 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 19499374440 in words is "nineteen billion, four hundred ninety-nine million, three hundred seventy-four thousand, four hundred forty".