1968557 has 4 divisors (see below), whose sum is σ = 1971456. Its totient is φ = 1965660.

The previous prime is 1968541. The next prime is 1968563. The reversal of 1968557 is 7558691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1968557 - 2⁴ = 1968541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968157) 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 in 3 ways as a sum of consecutive naturals, for example, 182 + ... + 1992.

It is an arithmetic number, because the mean of its divisors is an integer number (492864).

2^1968557 is an apocalyptic number.

It is an amenable number.

1968557 is a deficient number, since it is larger than the sum of its proper divisors (2899).

1968557 is a wasteful number, since it uses less digits than its factorization.

1968557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2898.

The product of its digits is 75600, while the sum is 41.

The square root of 1968557 is about 1403.0527431284. The cubic root of 1968557 is about 125.3283527207.

The spelling of 1968557 in words is "one million, nine hundred sixty-eight thousand, five hundred fifty-seven".