1557343 has 2 divisors, whose sum is σ = 1557344. Its totient is φ = 1557342.

The previous prime is 1557341. The next prime is 1557359. The reversal of 1557343 is 3437551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1557343 - 2¹ = 1557341 is a prime.

Together with 1557341, it forms a pair of twin primes.

1557343 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1557341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778671 + 778672.

It is an arithmetic number, because the mean of its divisors is an integer number (778672).

2^1557343 is an apocalyptic number.

1557343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557343 is an equidigital number, since it uses as much as digits as its factorization.

1557343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6300, while the sum is 28.

The square root of 1557343 is about 1247.9354951279. The cubic root of 1557343 is about 115.9119178740.

The spelling of 1557343 in words is "one million, five hundred fifty-seven thousand, three hundred forty-three".