2193717640 has 16 divisors (see below), whose sum is σ = 4935864780. Its totient is φ = 877487040.

The previous prime is 2193717619. The next prime is 2193717719. The reversal of 2193717640 is 467173912.

It can be written as a sum of positive squares in 2 ways, for example, as 2136473284 + 57244356 = 46222^2 + 7566^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 54842941 = 2193717640 / (2 + 1 + 9 + 3 + 7 + 1 + 7 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 2193717593 and 2193717602.

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, 27421431 + ... + 27421510.

Almost surely, 2^2193717640 is an apocalyptic number.

2193717640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2193717640 is an abundant number, since it is smaller than the sum of its proper divisors (2742147140).

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

2193717640 is a wasteful number, since it uses less digits than its factorization.

2193717640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54842952 (or 54842948 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 2193717640 is about 46837.1395369102. The cubic root of 2193717640 is about 1299.3522690347.

The spelling of 2193717640 in words is "two billion, one hundred ninety-three million, seven hundred seventeen thousand, six hundred forty".