7938139607 has 4 divisors (see below), whose sum is σ = 8087915880. Its totient is φ = 7788363336.

The previous prime is 7938139603. The next prime is 7938139631. The reversal of 7938139607 is 7069318397.

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: 7069318397 = 79 ⋅89485043.

It is a cyclic number.

It is not a de Polignac number, because 7938139607 - 2² = 7938139603 is a prime.

It is a super-2 number, since 2×7938139607² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 149776219 = 7938139607 / (7 + 9 + 3 + 8 + 1 + 3 + 9 + 6 + 0 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7938139603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74888057 + ... + 74888162.

It is an arithmetic number, because the mean of its divisors is an integer number (2021978970).

Almost surely, 2^7938139607 is an apocalyptic number.

7938139607 is a deficient number, since it is larger than the sum of its proper divisors (149776273).

7938139607 is a wasteful number, since it uses less digits than its factorization.

7938139607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149776272.

The product of its (nonzero) digits is 1714608, while the sum is 53.

The square root of 7938139607 is about 89096.2378947619. The cubic root of 7938139607 is about 1994.8316226929.

The spelling of 7938139607 in words is "seven billion, nine hundred thirty-eight million, one hundred thirty-nine thousand, six hundred seven".