40509547794 has 96 divisors (see below), whose sum is σ = 92461824000. Its totient is φ = 13290595344.

The previous prime is 40509547769. The next prime is 40509547853. The reversal of 40509547794 is 49774590504.

40509547794 is a `hidden beast` number, since 4 + 0 + 5 + 0 + 9 + 547 + 7 + 94 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40509547794.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 13781977 + ... + 13784915.

It is an arithmetic number, because the mean of its divisors is an integer number (963144000).

Almost surely, 2^40509547794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40509547794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46230912000).

40509547794 is an abundant number, since it is smaller than the sum of its proper divisors (51952276206).

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

40509547794 is a wasteful number, since it uses less digits than its factorization.

40509547794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3394 (or 3382 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 40509547794 in words is "forty billion, five hundred nine million, five hundred forty-seven thousand, seven hundred ninety-four".