2187939393 has 12 divisors (see below), whose sum is σ = 3181569300. Its totient is φ = 1448835936.

The previous prime is 2187939329. The next prime is 2187939407. The reversal of 2187939393 is 3939397812.

2187939393 is a `hidden beast` number, since 218 + 7 + 9 + 39 + 393 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 752514624 + 1435424769 = 27432^2 + 37887^2 .

It is not a de Polignac number, because 2187939393 - 2⁶ = 2187939329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2187931393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 814446 + ... + 817127.

It is an arithmetic number, because the mean of its divisors is an integer number (265130775).

Almost surely, 2^2187939393 is an apocalyptic number.

It is an amenable number.

2187939393 is a deficient number, since it is larger than the sum of its proper divisors (993629907).

2187939393 is a wasteful number, since it uses less digits than its factorization.

2187939393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631728 (or 1631725 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 2187939393 is about 46775.4144075710. The cubic root of 2187939393 is about 1298.2104356653.

The spelling of 2187939393 in words is "two billion, one hundred eighty-seven million, nine hundred thirty-nine thousand, three hundred ninety-three".