2191930 has 24 divisors (see below), whose sum is σ = 4275612. Its totient is φ = 808704.

The previous prime is 2191883. The next prime is 2191949. The reversal of 2191930 is 391912.

It can be written as a sum of positive squares in 6 ways, for example, as 885481 + 1306449 = 941^2 + 1143^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2191895 and 2191904.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1042 + ... + 2338.

2^2191930 is an apocalyptic number.

2191930 is a deficient number, since it is larger than the sum of its proper divisors (2083682).

2191930 is a wasteful number, since it uses less digits than its factorization.

2191930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330 (or 1317 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 2191930 is about 1480.5168016608. The cubic root of 2191930 is about 129.8999229782.

The spelling of 2191930 in words is "two million, one hundred ninety-one thousand, nine hundred thirty".