556397 has 4 divisors (see below), whose sum is σ = 563520. Its totient is φ = 549276.

The previous prime is 556373. The next prime is 556399. The reversal of 556397 is 793655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 793655 = 5 ⋅158731.

It is a cyclic number.

It is not a de Polignac number, because 556397 - 2¹² = 552301 is a prime.

It is a d-powerful number, because it can be written as 5 + 5³ + 3⁵ + 6⁵ + 9⁶ + 7⁵ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3443 + ... + 3600.

It is an arithmetic number, because the mean of its divisors is an integer number (140880).

2⁵⁵⁶³⁹⁷ is an apocalyptic number.

It is an amenable number.

556397 is a deficient number, since it is larger than the sum of its proper divisors (7123).

556397 is an equidigital number, since it uses as much as digits as its factorization.

556397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7122.

The product of its digits is 28350, while the sum is 35.

The square root of 556397 is about 745.9202370227. The cubic root of 556397 is about 82.2485518171.

The spelling of 556397 in words is "five hundred fifty-six thousand, three hundred ninety-seven".