1557043405 has 8 divisors (see below), whose sum is σ = 1870161912. Its totient is φ = 1244494848.

The previous prime is 1557043399. The next prime is 1557043421. The reversal of 1557043405 is 5043407551.

It can be written as a sum of positive squares in 4 ways, for example, as 83942244 + 1473101161 = 9162^2 + 38381^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1557043405 - 2¹¹ = 1557041357 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 136452 + ... + 147421.

It is an arithmetic number, because the mean of its divisors is an integer number (233770239).

Almost surely, 2^1557043405 is an apocalyptic number.

It is an amenable number.

1557043405 is a deficient number, since it is larger than the sum of its proper divisors (313118507).

1557043405 is a wasteful number, since it uses less digits than its factorization.

1557043405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284975.

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 1557043405 is about 39459.3893135715. The cubic root of 1557043405 is about 1159.0448451732.

The spelling of 1557043405 in words is "one billion, five hundred fifty-seven million, forty-three thousand, four hundred five".