1557216 has 36 divisors (see below), whose sum is σ = 4429152. Its totient is φ = 518976.

The previous prime is 1557211. The next prime is 1557239. The reversal of 1557216 is 6127551.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1557216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2416 + ... + 2991.

It is an arithmetic number, because the mean of its divisors is an integer number (123032).

2^1557216 is an apocalyptic number.

1557216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1557216 is an abundant number, since it is smaller than the sum of its proper divisors (2871936).

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

1557216 is a wasteful number, since it uses less digits than its factorization.

1557216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5423 (or 5412 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 1557216 is about 1247.8846100501. The cubic root of 1557216 is about 115.9087669489.

The spelling of 1557216 in words is "one million, five hundred fifty-seven thousand, two hundred sixteen".