542056399 has 4 divisors (see below), whose sum is σ = 542131720. Its totient is φ = 541981080.

The previous prime is 542056397. The next prime is 542056439. The reversal of 542056399 is 993650245.

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

It is a cyclic number.

It is not a de Polignac number, because 542056399 - 2¹ = 542056397 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 (542056391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25572 + ... + 41689.

It is an arithmetic number, because the mean of its divisors is an integer number (135532930).

Almost surely, 2^542056399 is an apocalyptic number.

542056399 is a deficient number, since it is larger than the sum of its proper divisors (75321).

542056399 is an equidigital number, since it uses as much as digits as its factorization.

542056399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75320.

The product of its (nonzero) digits is 291600, while the sum is 43.

The square root of 542056399 is about 23282.1046943785. The cubic root of 542056399 is about 815.3576655393.

The spelling of 542056399 in words is "five hundred forty-two million, fifty-six thousand, three hundred ninety-nine".