2188239957 has 12 divisors (see below), whose sum is σ = 3174596620. Its totient is φ = 1452454848.

The previous prime is 2188239953. The next prime is 2188239961. The reversal of 2188239957 is 7599328812.

It is an interprime number because it is at equal distance from previous prime (2188239953) and next prime (2188239961).

It can be written as a sum of positive squares in 2 ways, for example, as 843844401 + 1344395556 = 29049^2 + 36666^2 .

It is not a de Polignac number, because 2188239957 - 2² = 2188239953 is a prime.

It is a super-2 number, since 2×2188239957² = 9576788218822723698, 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 (2188239953) 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, 528808 + ... + 532929.

Almost surely, 2^2188239957 is an apocalyptic number.

It is an amenable number.

2188239957 is a deficient number, since it is larger than the sum of its proper divisors (986356663).

2188239957 is a wasteful number, since it uses less digits than its factorization.

2188239957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061972 (or 1061969 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 2188239957 is about 46778.6271388975. The cubic root of 2188239957 is about 1298.2698793374.

The spelling of 2188239957 in words is "two billion, one hundred eighty-eight million, two hundred thirty-nine thousand, nine hundred fifty-seven".