2197930638 has 16 divisors (see below), whose sum is σ = 4498091136. Its totient is φ = 715605240.

The previous prime is 2197930627. The next prime is 2197930639. The reversal of 2197930638 is 8360397912.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2197930639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4259298 + ... + 4259813.

It is an arithmetic number, because the mean of its divisors is an integer number (281130696).

Almost surely, 2^2197930638 is an apocalyptic number.

2197930638 is an abundant number, since it is smaller than the sum of its proper divisors (2300160498).

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

2197930638 is a wasteful number, since it uses less digits than its factorization.

2197930638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8519159.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 2197930638 is about 46882.0929353629. The cubic root of 2197930638 is about 1300.1835318790.

The spelling of 2197930638 in words is "two billion, one hundred ninety-seven million, nine hundred thirty thousand, six hundred thirty-eight".