7315121838 has 16 divisors (see below), whose sum is σ = 14631195600. Its totient is φ = 2438215296.

The previous prime is 7315121831. The next prime is 7315121867. The reversal of 7315121838 is 8381215137.

It is a super-2 number, since 2×7315121838² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7315121796 and 7315121805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7315121831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95856 + ... + 154332.

It is an arithmetic number, because the mean of its divisors is an integer number (914449725).

Almost surely, 2^7315121838 is an apocalyptic number.

7315121838 is an abundant number, since it is smaller than the sum of its proper divisors (7316073762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7315121838 is a wasteful number, since it uses less digits than its factorization.

7315121838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79331.

The product of its digits is 40320, while the sum is 39.

The square root of 7315121838 is about 85528.4855355220. The cubic root of 7315121838 is about 1941.2159661763.

The spelling of 7315121838 in words is "seven billion, three hundred fifteen million, one hundred twenty-one thousand, eight hundred thirty-eight".