1938557 has 2 divisors, whose sum is σ = 1938558. Its totient is φ = 1938556.

The previous prime is 1938553. The next prime is 1938571. The reversal of 1938557 is 7558391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1331716 + 606841 = 1154^2 + 779^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938557 - 2² = 1938553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1938557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1938553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969278 + 969279.

It is an arithmetic number, because the mean of its divisors is an integer number (969279).

2^1938557 is an apocalyptic number.

It is an amenable number.

1938557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938557 is an equidigital number, since it uses as much as digits as its factorization.

1938557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 1938557 is about 1392.3207245459. The cubic root of 1938557 is about 124.6884400886.

The spelling of 1938557 in words is "one million, nine hundred thirty-eight thousand, five hundred fifty-seven".