7785400940 has 24 divisors (see below), whose sum is σ = 16440686640. Its totient is φ = 3096761408.

The previous prime is 7785400901. The next prime is 7785400949. The reversal of 7785400940 is 490045877.

It is a super-2 number, since 2×7785400940² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7785400891 and 7785400900.

It is not an unprimeable number, because it can be changed into a prime (7785400949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1083767 + ... + 1090926.

It is an arithmetic number, because the mean of its divisors is an integer number (685028610).

Almost surely, 2^7785400940 is an apocalyptic number.

It is an amenable number.

7785400940 is an abundant number, since it is smaller than the sum of its proper divisors (8655285700).

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

7785400940 is a wasteful number, since it uses less digits than its factorization.

7785400940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174881 (or 2174879 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 7785400940 is about 88234.9190513597. The cubic root of 7785400940 is about 1981.9544130986.

The spelling of 7785400940 in words is "seven billion, seven hundred eighty-five million, four hundred thousand, nine hundred forty".