5138623949 has 4 divisors (see below), whose sum is σ = 5440895964. Its totient is φ = 4836351936.

The previous prime is 5138623943. The next prime is 5138623979. The reversal of 5138623949 is 9493268315.

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: 9493268315 = 5 ⋅1898653663.

It can be written as a sum of positive squares in 2 ways, for example, as 2296134724 + 2842489225 = 47918^2 + 53315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5138623949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5138623897 and 5138623906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5138623943) 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, 151135982 + ... + 151136015.

It is an arithmetic number, because the mean of its divisors is an integer number (1360223991).

Almost surely, 2^5138623949 is an apocalyptic number.

It is an amenable number.

5138623949 is a deficient number, since it is larger than the sum of its proper divisors (302272015).

5138623949 is a wasteful number, since it uses less digits than its factorization.

5138623949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302272014.

The product of its digits is 1399680, while the sum is 50.

The square root of 5138623949 is about 71684.1959500140. The cubic root of 5138623949 is about 1725.6350191896.

The spelling of 5138623949 in words is "five billion, one hundred thirty-eight million, six hundred twenty-three thousand, nine hundred forty-nine".