2191295940 has 48 divisors (see below), whose sum is σ = 6137859840. Its totient is φ = 584133120.

The previous prime is 2191295929. The next prime is 2191295959. The reversal of 2191295940 is 495921912.

It is a junction number, because it is equal to n+sod(n) for n = 2191295892 and 2191295901.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228645 + ... + 238035.

It is an arithmetic number, because the mean of its divisors is an integer number (127872080).

Almost surely, 2^2191295940 is an apocalyptic number.

2191295940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191295940 is an abundant number, since it is smaller than the sum of its proper divisors (3946563900).

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

2191295940 is a wasteful number, since it uses less digits than its factorization.

2191295940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13292 (or 13290 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 2191295940 is about 46811.2800508595. The cubic root of 2191295940 is about 1298.8739637857.

The spelling of 2191295940 in words is "two billion, one hundred ninety-one million, two hundred ninety-five thousand, nine hundred forty".