1557249444 has 27 divisors (see below), whose sum is σ = 3936979137. Its totient is φ = 519004224.

The previous prime is 1557249439. The next prime is 1557249457. The reversal of 1557249444 is 4449427551.

The square root of 1557249444 is 39462.

It is a perfect power (a square), and thus also a powerful number.

1557249444 is a `hidden beast` number, since 1 + 55 + 72 + 494 + 44 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1542132900 + 15116544 = 39270^2 + 3888^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1557249444.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 233484 + ... + 240060.

Almost surely, 2^1557249444 is an apocalyptic number.

1557249444 is the 39462-nd square number.

It is an amenable number.

1557249444 is an abundant number, since it is smaller than the sum of its proper divisors (2379729693).

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

1557249444 is an frugal number, since it uses more digits than its factorization.

1557249444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13164 (or 6582 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The cubic root of 1557249444 is about 1159.0959672565.

It can be divided in two parts, 1557 and 249444, that added together give a square (251001 = 501²).

The spelling of 1557249444 in words is "one billion, five hundred fifty-seven million, two hundred forty-nine thousand, four hundred forty-four".