556378399 has 2 divisors, whose sum is σ = 556378400. Its totient is φ = 556378398.

The previous prime is 556378351. The next prime is 556378409. The reversal of 556378399 is 993873655.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 556378399 - 2²³ = 547989791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556375399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278189199 + 278189200.

It is an arithmetic number, because the mean of its divisors is an integer number (278189200).

Almost surely, 2^556378399 is an apocalyptic number.

556378399 is a deficient number, since it is larger than the sum of its proper divisors (1).

556378399 is an equidigital number, since it uses as much as digits as its factorization.

556378399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6123600, while the sum is 55.

The square root of 556378399 is about 23587.6747264329. The cubic root of 556378399 is about 822.4763525196.

The spelling of 556378399 in words is "five hundred fifty-six million, three hundred seventy-eight thousand, three hundred ninety-nine".