542639709 has 8 divisors (see below), whose sum is σ = 803910720. Its totient is φ = 361759788.

The previous prime is 542639707. The next prime is 542639731. The reversal of 542639709 is 907936245.

It is a happy number.

542639709 is a `hidden beast` number, since 5 + 4 + 2 + 639 + 7 + 0 + 9 = 666.

It is not a de Polignac number, because 542639709 - 2¹ = 542639707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542639707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10048857 + ... + 10048910.

It is an arithmetic number, because the mean of its divisors is an integer number (100488840).

Almost surely, 2^542639709 is an apocalyptic number.

It is an amenable number.

542639709 is a deficient number, since it is larger than the sum of its proper divisors (261271011).

542639709 is a wasteful number, since it uses less digits than its factorization.

542639709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20097776 (or 20097770 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 542639709 is about 23294.6283292951. The cubic root of 542639709 is about 815.6500310458.

The spelling of 542639709 in words is "five hundred forty-two million, six hundred thirty-nine thousand, seven hundred nine".