388640121709 has 8 divisors (see below), whose sum is σ = 444940741440. Its totient is φ = 332534652576.

The previous prime is 388640121643. The next prime is 388640121739. The reversal of 388640121709 is 907121046883.

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

It is not a de Polignac number, because 388640121709 - 2¹⁹ = 388639597421 is a prime.

It is a super-2 number, since 2×388640121709² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388640121739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48783379 + ... + 48791344.

It is an arithmetic number, because the mean of its divisors is an integer number (55617592680).

Almost surely, 2^388640121709 is an apocalyptic number.

It is an amenable number.

388640121709 is a deficient number, since it is larger than the sum of its proper divisors (56300619731).

388640121709 is an equidigital number, since it uses as much as digits as its factorization.

388640121709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97575299.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 388640121709 in words is "three hundred eighty-eight billion, six hundred forty million, one hundred twenty-one thousand, seven hundred nine".