5139421 has 4 divisors (see below), whose sum is σ = 5873632. Its totient is φ = 4405212.

The previous prime is 5139413. The next prime is 5139427. The reversal of 5139421 is 1249315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1249315 = 5 ⋅249863.

It is not a de Polignac number, because 5139421 - 2³ = 5139413 is a prime.

It is a Duffinian number.

5139421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5139427) 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, 367095 + ... + 367108.

It is an arithmetic number, because the mean of its divisors is an integer number (1468408).

Almost surely, 2^5139421 is an apocalyptic number.

It is an amenable number.

5139421 is a deficient number, since it is larger than the sum of its proper divisors (734211).

5139421 is an equidigital number, since it uses as much as digits as its factorization.

5139421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734210.

The product of its digits is 1080, while the sum is 25.

The square root of 5139421 is about 2267.0291131787. The cubic root of 5139421 is about 172.5724235552.

It can be divided in two parts, 51394 and 21, that added together give a palindrome (51415).

The spelling of 5139421 in words is "five million, one hundred thirty-nine thousand, four hundred twenty-one".