1557434 has 4 divisors (see below), whose sum is σ = 2336154. Its totient is φ = 778716.

The previous prime is 1557433. The next prime is 1557443. The reversal of 1557434 is 4347551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4347551 = 13 ⋅334427.

It can be written as a sum of positive squares in only one way, i.e., 1203409 + 354025 = 1097^2 + 595^2 .

It is a super-3 number, since 3×1557434³ = 11333138835271867512, which contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1557397 and 1557406.

It is not an unprimeable number, because it can be changed into a prime (1557433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389357 + ... + 389360.

2^1557434 is an apocalyptic number.

1557434 is a deficient number, since it is larger than the sum of its proper divisors (778720).

1557434 is an equidigital number, since it uses as much as digits as its factorization.

1557434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778719.

The product of its digits is 8400, while the sum is 29.

The square root of 1557434 is about 1247.9719548131. The cubic root of 1557434 is about 115.9141755182.

It can be divided in two parts, 1557 and 434, that added together give a palindrome (1991).

The spelling of 1557434 in words is "one million, five hundred fifty-seven thousand, four hundred thirty-four".