1557172 has 12 divisors (see below), whose sum is σ = 2763936. Its totient is φ = 767480.

The previous prime is 1557151. The next prime is 1557211. The reversal of 1557172 is 2717551.

It is a self number, because there is not a number n which added to its sum of digits gives 1557172.

It is a congruent number.

It is an unprimeable number.

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, 2458 + ... + 3025.

It is an arithmetic number, because the mean of its divisors is an integer number (230328).

2^1557172 is an apocalyptic number.

It is an amenable number.

1557172 is a deficient number, since it is larger than the sum of its proper divisors (1206764).

1557172 is a wasteful number, since it uses less digits than its factorization.

1557172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5558 (or 5556 counting only the distinct ones).

The product of its digits is 2450, while the sum is 28.

The square root of 1557172 is about 1247.8669800904. The cubic root of 1557172 is about 115.9076752498.

The spelling of 1557172 in words is "one million, five hundred fifty-seven thousand, one hundred seventy-two".