7378121913 has 16 divisors (see below), whose sum is σ = 10424937600. Its totient is φ = 4633301120.

The previous prime is 7378121909. The next prime is 7378121921. The reversal of 7378121913 is 3191218737.

It is a cyclic number.

It is not a de Polignac number, because 7378121913 - 2² = 7378121909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7378121963) 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 15 ways as a sum of consecutive naturals, for example, 1030653 + ... + 1037786.

It is an arithmetic number, because the mean of its divisors is an integer number (651558600).

Almost surely, 2^7378121913 is an apocalyptic number.

It is an amenable number.

7378121913 is a deficient number, since it is larger than the sum of its proper divisors (3046815687).

7378121913 is a wasteful number, since it uses less digits than its factorization.

7378121913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2068512.

The product of its digits is 63504, while the sum is 42.

The square root of 7378121913 is about 85895.9947436433. The cubic root of 7378121913 is about 1946.7728267301.

The spelling of 7378121913 in words is "seven billion, three hundred seventy-eight million, one hundred twenty-one thousand, nine hundred thirteen".