3728918121 has 8 divisors (see below), whose sum is σ = 4972913664. Its totient is φ = 2485434000.

The previous prime is 3728918099. The next prime is 3728918129. The reversal of 3728918121 is 1218198273.

3728918121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 3728918121 - 2¹⁰ = 3728917097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3728918129) 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, 110505 + ... + 140246.

It is an arithmetic number, because the mean of its divisors is an integer number (621614208).

Almost surely, 2^3728918121 is an apocalyptic number.

It is an amenable number.

3728918121 is a deficient number, since it is larger than the sum of its proper divisors (1243995543).

3728918121 is a wasteful number, since it uses less digits than its factorization.

3728918121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255711.

The product of its digits is 48384, while the sum is 42.

The square root of 3728918121 is about 61064.8681403637. The cubic root of 3728918121 is about 1550.6993889884.

The spelling of 3728918121 in words is "three billion, seven hundred twenty-eight million, nine hundred eighteen thousand, one hundred twenty-one".