542878139 has 4 divisors (see below), whose sum is σ = 555503256. Its totient is φ = 530253024.

The previous prime is 542878093. The next prime is 542878201. The reversal of 542878139 is 931878245.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931878245 = 5 ⋅186375649.

It is a cyclic number.

It is not a de Polignac number, because 542878139 - 2²⁴ = 526100923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 542878093 and 542878102.

It is not an unprimeable number, because it can be changed into a prime (542878339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6312494 + ... + 6312579.

It is an arithmetic number, because the mean of its divisors is an integer number (138875814).

Almost surely, 2^542878139 is an apocalyptic number.

542878139 is a deficient number, since it is larger than the sum of its proper divisors (12625117).

542878139 is a wasteful number, since it uses less digits than its factorization.

542878139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12625116.

The product of its digits is 483840, while the sum is 47.

The square root of 542878139 is about 23299.7454707128. The cubic root of 542878139 is about 815.7694761442.

It can be divided in two parts, 54287 and 8139, that added together give a palindrome (62426).

The spelling of 542878139 in words is "five hundred forty-two million, eight hundred seventy-eight thousand, one hundred thirty-nine".