2193466640 has 20 divisors (see below), whose sum is σ = 5099810124. Its totient is φ = 877386624.

The previous prime is 2193466603. The next prime is 2193466643. The reversal of 2193466640 is 466643912.

It can be written as a sum of positive squares in 2 ways, for example, as 1202979856 + 990486784 = 34684^2 + 31472^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×2193466640² = 9622591801585779200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2193466643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13709087 + ... + 13709246.

Almost surely, 2^2193466640 is an apocalyptic number.

2193466640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2193466640 is an abundant number, since it is smaller than the sum of its proper divisors (2906343484).

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

2193466640 is a wasteful number, since it uses less digits than its factorization.

2193466640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27418346 (or 27418340 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 2193466640 is about 46834.4599627240. The cubic root of 2193466640 is about 1299.3027108702.

The spelling of 2193466640 in words is "two billion, one hundred ninety-three million, four hundred sixty-six thousand, six hundred forty".