1557273340 has 96 divisors (see below), whose sum is σ = 3798990720. Its totient is φ = 525213696.

The previous prime is 1557273323. The next prime is 1557273343. The reversal of 1557273340 is 433727551.

It is a super-4 number, since 4×1557273340⁴ (a number of 38 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1557273340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1557273343) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2736576 + ... + 2737144.

It is an arithmetic number, because the mean of its divisors is an integer number (39572820).

Almost surely, 2^1557273340 is an apocalyptic number.

1557273340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1557273340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1899495360).

1557273340 is an abundant number, since it is smaller than the sum of its proper divisors (2241717380).

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

1557273340 is a wasteful number, since it uses less digits than its factorization.

1557273340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871 (or 869 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 37.

The square root of 1557273340 is about 39462.3027711258. The cubic root of 1557273340 is about 1159.1018960039.

The spelling of 1557273340 in words is "one billion, five hundred fifty-seven million, two hundred seventy-three thousand, three hundred forty".