2197938877 has 4 divisors (see below), whose sum is σ = 2210643900. Its totient is φ = 2185233856.

The previous prime is 2197938817. The next prime is 2197938889. The reversal of 2197938877 is 7788397912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1346816601 + 851122276 = 36699^2 + 29174^2 .

It is a cyclic number.

It is not a de Polignac number, because 2197938877 - 2²³ = 2189550269 is a prime.

It is a super-2 number, since 2×2197938877² = 9661870614056042258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2197938817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6352252 + ... + 6352597.

It is an arithmetic number, because the mean of its divisors is an integer number (552660975).

Almost surely, 2^2197938877 is an apocalyptic number.

It is an amenable number.

2197938877 is a deficient number, since it is larger than the sum of its proper divisors (12705023).

2197938877 is a wasteful number, since it uses less digits than its factorization.

2197938877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12705022.

The product of its digits is 10668672, while the sum is 61.

The square root of 2197938877 is about 46882.1808046511. The cubic root of 2197938877 is about 1300.1851564675.

The spelling of 2197938877 in words is "two billion, one hundred ninety-seven million, nine hundred thirty-eight thousand, eight hundred seventy-seven".