542978 has 4 divisors (see below), whose sum is σ = 814470. Its totient is φ = 271488.

The previous prime is 542951. The next prime is 542981. The reversal of 542978 is 879245.

It is a happy number.

542978 is nontrivially palindromic in base 8.

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., 305809 + 237169 = 553^2 + 487^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135743 + ... + 135746.

2⁵⁴²⁹⁷⁸ is an apocalyptic number.

542978 is a deficient number, since it is larger than the sum of its proper divisors (271492).

542978 is a wasteful number, since it uses less digits than its factorization.

542978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271491.

The product of its digits is 20160, while the sum is 35.

The square root of 542978 is about 736.8704092308. The cubic root of 542978 is about 81.5819492624.

The spelling of 542978 in words is "five hundred forty-two thousand, nine hundred seventy-eight".