555397 has 4 divisors (see below), whose sum is σ = 557260. Its totient is φ = 553536.

The previous prime is 555391. The next prime is 555419. The reversal of 555397 is 793555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 206116 + 349281 = 454^2 + 591^2 .

It is a 3-Lehmer number, since φ(555397) divides (555397-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-555397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555391) 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, 372 + ... + 1117.

It is an arithmetic number, because the mean of its divisors is an integer number (139315).

2⁵⁵⁵³⁹⁷ is an apocalyptic number.

555397 is the 373-rd decagonal number.

It is an amenable number.

555397 is a deficient number, since it is larger than the sum of its proper divisors (1863).

555397 is a wasteful number, since it uses less digits than its factorization.

555397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862.

The product of its digits is 23625, while the sum is 34.

The square root of 555397 is about 745.2496226098. The cubic root of 555397 is about 82.1992477677.

It can be divided in two parts, 55 and 5397, that multiplied together give a triangular number (296835 = T₇₇₀).

The spelling of 555397 in words is "five hundred fifty-five thousand, three hundred ninety-seven".