7938815901 has 8 divisors (see below), whose sum is σ = 10598784480. Its totient is φ = 5285695632.

The previous prime is 7938815897. The next prime is 7938815909. The reversal of 7938815901 is 1095188397.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7938815901 - 2² = 7938815897 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7938815909) 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 7 ways as a sum of consecutive naturals, for example, 1709371 + ... + 1714008.

It is an arithmetic number, because the mean of its divisors is an integer number (1324848060).

Almost surely, 2^7938815901 is an apocalyptic number.

It is an amenable number.

7938815901 is a deficient number, since it is larger than the sum of its proper divisors (2659968579).

7938815901 is a wasteful number, since it uses less digits than its factorization.

7938815901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3424155.

The product of its (nonzero) digits is 544320, while the sum is 51.

The square root of 7938815901 is about 89100.0331144720. The cubic root of 7938815901 is about 1994.8882713290. Note that the first 3 decimals are identical.

The spelling of 7938815901 in words is "seven billion, nine hundred thirty-eight million, eight hundred fifteen thousand, nine hundred one".