1988257 has 2 divisors, whose sum is σ = 1988258. Its totient is φ = 1988256.

The previous prime is 1988251. The next prime is 1988263. The reversal of 1988257 is 7528891.

It is a balanced prime because it is at equal distance from previous prime (1988251) and next prime (1988263).

It can be written as a sum of positive squares in only one way, i.e., 1846881 + 141376 = 1359^2 + 376^2 .

It is an emirp because it is prime and its reverse (7528891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1988257 - 2³ = 1988249 is a prime.

It is not a weakly prime, because it can be changed into another prime (1988251) 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 as a sum of consecutive naturals, namely, 994128 + 994129.

It is an arithmetic number, because the mean of its divisors is an integer number (994129).

2^1988257 is an apocalyptic number.

It is an amenable number.

1988257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988257 is an equidigital number, since it uses as much as digits as its factorization.

1988257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 40.

The square root of 1988257 is about 1410.0556726598. The cubic root of 1988257 is about 125.7450332480.

The spelling of 1988257 in words is "one million, nine hundred eighty-eight thousand, two hundred fifty-seven".