7940188040 has 16 divisors (see below), whose sum is σ = 17865423180. Its totient is φ = 3176075200.

The previous prime is 7940188033. The next prime is 7940188099. The reversal of 7940188040 is 408810497.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7606979524 + 333208516 = 87218^2 + 18254^2 .

It is a super-2 number, since 2×7940188040² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99252311 + ... + 99252390.

Almost surely, 2^7940188040 is an apocalyptic number.

It is an amenable number.

7940188040 is an abundant number, since it is smaller than the sum of its proper divisors (9925235140).

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

7940188040 is a wasteful number, since it uses less digits than its factorization.

7940188040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198504712 (or 198504708 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 7940188040 is about 89107.7327733121. The cubic root of 7940188040 is about 1995.0031963735.

The spelling of 7940188040 in words is "seven billion, nine hundred forty million, one hundred eighty-eight thousand, forty".