1557035985 has 16 divisors (see below), whose sum is σ = 2497542336. Its totient is φ = 828324288.

The previous prime is 1557035971. The next prime is 1557035989. The reversal of 1557035985 is 5895307551.

It is not a de Polignac number, because 1557035985 - 2⁴ = 1557035969 is a prime.

It is a super-2 number, since 2×1557035985² = 4848722117169840450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1557035989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124779 + ... + 136688.

It is an arithmetic number, because the mean of its divisors is an integer number (156096396).

Almost surely, 2^1557035985 is an apocalyptic number.

1557035985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1557035985 is a deficient number, since it is larger than the sum of its proper divisors (940506351).

1557035985 is a wasteful number, since it uses less digits than its factorization.

1557035985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261872.

The product of its (nonzero) digits is 945000, while the sum is 48.

The square root of 1557035985 is about 39459.2952927444. The cubic root of 1557035985 is about 1159.0430040500.

The spelling of 1557035985 in words is "one billion, five hundred fifty-seven million, thirty-five thousand, nine hundred eighty-five".