1557345 has 16 divisors (see below), whose sum is σ = 2545920. Its totient is φ = 812912.

The previous prime is 1557343. The next prime is 1557359. The reversal of 1557345 is 5437551.

It is not a de Polignac number, because 1557345 - 2¹ = 1557343 is a prime.

1557345 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1557341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33112 + ... + 33158.

It is an arithmetic number, because the mean of its divisors is an integer number (159120).

2^1557345 is an apocalyptic number.

1557345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1557345 is a deficient number, since it is larger than the sum of its proper divisors (988575).

1557345 is an frugal number, since it uses more digits than its factorization.

1557345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 55 counting only the distinct ones).

The product of its digits is 10500, while the sum is 30.

The square root of 1557345 is about 1247.9362964511. The cubic root of 1557345 is about 115.9119674935.

The spelling of 1557345 in words is "one million, five hundred fifty-seven thousand, three hundred forty-five".