5138842 has 4 divisors (see below), whose sum is σ = 7708266. Its totient is φ = 2569420.

The previous prime is 5138831. The next prime is 5138849. The reversal of 5138842 is 2488315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2488315 = 5 ⋅497663.

It can be written as a sum of positive squares in only one way, i.e., 4704561 + 434281 = 2169^2 + 659^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (5138849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284709 + ... + 1284712.

Almost surely, 2^5138842 is an apocalyptic number.

5138842 is a deficient number, since it is larger than the sum of its proper divisors (2569424).

5138842 is a wasteful number, since it uses less digits than its factorization.

5138842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2569423.

The product of its digits is 7680, while the sum is 31.

The square root of 5138842 is about 2266.9014094133. The cubic root of 5138842 is about 172.5659427223.

The spelling of 5138842 in words is "five million, one hundred thirty-eight thousand, eight hundred forty-two".