542739685 has 4 divisors (see below), whose sum is σ = 651287628. Its totient is φ = 434191744.

The previous prime is 542739677. The next prime is 542739697. The reversal of 542739685 is 586937245.

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

It can be written as a sum of positive squares in 2 ways, for example, as 223831521 + 318908164 = 14961^2 + 17858^2 .

It is a cyclic number.

It is not a de Polignac number, because 542739685 - 2³ = 542739677 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 54273964 + ... + 54273973.

It is an arithmetic number, because the mean of its divisors is an integer number (162821907).

Almost surely, 2^542739685 is an apocalyptic number.

It is an amenable number.

542739685 is a deficient number, since it is larger than the sum of its proper divisors (108547943).

542739685 is a wasteful number, since it uses less digits than its factorization.

542739685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108547942.

The product of its digits is 1814400, while the sum is 49.

The square root of 542739685 is about 23296.7741329138. The cubic root of 542739685 is about 815.7001197871.

The spelling of 542739685 in words is "five hundred forty-two million, seven hundred thirty-nine thousand, six hundred eighty-five".