7854781940 has 24 divisors (see below), whose sum is σ = 16846002432. Its totient is φ = 3075063200.

The previous prime is 7854781931. The next prime is 7854781943. The reversal of 7854781940 is 491874587.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7854781943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4177136 + ... + 4179015.

It is an arithmetic number, because the mean of its divisors is an integer number (701916768).

Almost surely, 2^7854781940 is an apocalyptic number.

It is an amenable number.

7854781940 is an abundant number, since it is smaller than the sum of its proper divisors (8991220492).

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

7854781940 is a wasteful number, since it uses less digits than its factorization.

7854781940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8356207 (or 8356205 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 53.

The square root of 7854781940 is about 88627.2076734904. The cubic root of 7854781940 is about 1987.8245243058.

The spelling of 7854781940 in words is "seven billion, eight hundred fifty-four million, seven hundred eighty-one thousand, nine hundred forty".