1557668 has 12 divisors (see below), whose sum is σ = 3115392. Its totient is φ = 667560.

The previous prime is 1557667. The next prime is 1557707. The reversal of 1557668 is 8667551.

It is a happy number.

1557668 is an admirable number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1557667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27788 + ... + 27843.

It is an arithmetic number, because the mean of its divisors is an integer number (259616).

2^1557668 is an apocalyptic number.

It is an amenable number.

1557668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1557668 is a wasteful number, since it uses less digits than its factorization.

1557668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55642 (or 55640 counting only the distinct ones).

The product of its digits is 50400, while the sum is 38.

The square root of 1557668 is about 1248.0657033987. The cubic root of 1557668 is about 115.9199804852.

The spelling of 1557668 in words is "one million, five hundred fifty-seven thousand, six hundred sixty-eight".