556390423 has 4 divisors (see below), whose sum is σ = 571428040. Its totient is φ = 541352808.

The previous prime is 556390421. The next prime is 556390427. The reversal of 556390423 is 324093655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324093655 = 5 ⋅64818731.

It is a cyclic number.

It is not a de Polignac number, because 556390423 - 2¹ = 556390421 is a prime.

It is a super-2 number, since 2×556390423² = 619140605612237858, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 15037579 = 556390423 / (5 + 5 + 6 + 3 + 9 + 0 + 4 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556390421) 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 in 3 ways as a sum of consecutive naturals, for example, 7518753 + ... + 7518826.

It is an arithmetic number, because the mean of its divisors is an integer number (142857010).

Almost surely, 2^556390423 is an apocalyptic number.

556390423 is a deficient number, since it is larger than the sum of its proper divisors (15037617).

556390423 is a wasteful number, since it uses less digits than its factorization.

556390423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15037616.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 556390423 is about 23587.9296039309. The cubic root of 556390423 is about 822.4822773749.

The spelling of 556390423 in words is "five hundred fifty-six million, three hundred ninety thousand, four hundred twenty-three".