1557225730 has 16 divisors (see below), whose sum is σ = 2809094904. Its totient is φ = 621537280.

The previous prime is 1557225641. The next prime is 1557225743. The reversal of 1557225730 is 375227551.

It can be written as a sum of positive squares in 4 ways, for example, as 1383170481 + 174055249 = 37191^2 + 13193^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1557225730.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164287 + ... + 173506.

Almost surely, 2^1557225730 is an apocalyptic number.

1557225730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1557225730 is a deficient number, since it is larger than the sum of its proper divisors (1251869174).

1557225730 is a wasteful number, since it uses less digits than its factorization.

1557225730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338261.

The product of its (nonzero) digits is 73500, while the sum is 37.

The square root of 1557225730 is about 39461.6995325848. The cubic root of 1557225730 is about 1159.0900836046.

The spelling of 1557225730 in words is "one billion, five hundred fifty-seven million, two hundred twenty-five thousand, seven hundred thirty".