1557144 has 64 divisors (see below), whose sum is σ = 4428000. Its totient is φ = 513216.

The previous prime is 1557137. The next prime is 1557151. The reversal of 1557144 is 4417551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1557137) and next prime (1557151).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17452 + ... + 17540.

2^1557144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1557144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2214000).

1557144 is an abundant number, since it is smaller than the sum of its proper divisors (2870856).

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

1557144 is an frugal number, since it uses more digits than its factorization.

1557144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 94 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 1557144 is about 1247.8557608955. The cubic root of 1557144 is about 115.9069805215.

The spelling of 1557144 in words is "one million, five hundred fifty-seven thousand, one hundred forty-four".