509994442 has 4 divisors (see below), whose sum is σ = 764991666. Its totient is φ = 254997220.

The previous prime is 509994437. The next prime is 509994451. The reversal of 509994442 is 244499905.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 487040761 + 22953681 = 22069^2 + 4791^2 .

It is a junction number, because it is equal to n+sod(n) for n = 509994392 and 509994401.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 127498609 + ... + 127498612.

Almost surely, 2^509994442 is an apocalyptic number.

509994442 is a deficient number, since it is larger than the sum of its proper divisors (254997224).

509994442 is a wasteful number, since it uses less digits than its factorization.

509994442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254997223.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 509994442 is about 22583.0565247488. The cubic root of 509994442 is about 798.9540716800.

The spelling of 509994442 in words is "five hundred nine million, nine hundred ninety-four thousand, four hundred forty-two".