19440793620 has 72 divisors (see below), whose sum is σ = 59521591584. Its totient is φ = 5135755968.

The previous prime is 19440793601. The next prime is 19440793621. The reversal of 19440793620 is 2639704491.

It is a happy number.

19440793620 is a `hidden beast` number, since 19 + 4 + 4 + 0 + 7 + 9 + 3 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440793621) 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, 485434 + ... + 523953.

It is an arithmetic number, because the mean of its divisors is an integer number (826688772).

Almost surely, 2^19440793620 is an apocalyptic number.

19440793620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19440793620 is an abundant number, since it is smaller than the sum of its proper divisors (40080797964).

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

19440793620 is a wasteful number, since it uses less digits than its factorization.

19440793620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009509 (or 1009504 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 19440793620 in words is "nineteen billion, four hundred forty million, seven hundred ninety-three thousand, six hundred twenty".