3988172957 has 2 divisors, whose sum is σ = 3988172958. Its totient is φ = 3988172956.

The previous prime is 3988172939. The next prime is 3988172959. The reversal of 3988172957 is 7592718893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2146561561 + 1841611396 = 46331^2 + 42914^2 .

It is a cyclic number.

It is not a de Polignac number, because 3988172957 - 2⁸ = 3988172701 is a prime.

It is a super-2 number, since 2×3988172957² = 31811047069892247698, which contains 22 as substring.

Together with 3988172959, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3988172896 and 3988172905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3988172959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994086478 + 1994086479.

It is an arithmetic number, because the mean of its divisors is an integer number (1994086479).

Almost surely, 2^3988172957 is an apocalyptic number.

It is an amenable number.

3988172957 is a deficient number, since it is larger than the sum of its proper divisors (1).

3988172957 is an equidigital number, since it uses as much as digits as its factorization.

3988172957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 59.

The square root of 3988172957 is about 63151.9830013278. The cubic root of 3988172957 is about 1585.8349857498.

The spelling of 3988172957 in words is "three billion, nine hundred eighty-eight million, one hundred seventy-two thousand, nine hundred fifty-seven".