3988507421 has 4 divisors (see below), whose sum is σ = 4063762332. Its totient is φ = 3913252512.

The previous prime is 3988507381. The next prime is 3988507433. The reversal of 3988507421 is 1247058893.

It is a happy number.

3988507421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1519908196 + 2468599225 = 38986^2 + 49685^2 .

It is a cyclic number.

It is not a de Polignac number, because 3988507421 - 2⁶ = 3988507357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3988507451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37627376 + ... + 37627481.

It is an arithmetic number, because the mean of its divisors is an integer number (1015940583).

Almost surely, 2^3988507421 is an apocalyptic number.

It is an amenable number.

3988507421 is a deficient number, since it is larger than the sum of its proper divisors (75254911).

3988507421 is an equidigital number, since it uses as much as digits as its factorization.

3988507421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75254910.

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 3988507421 is about 63154.6310336780. The cubic root of 3988507421 is about 1585.8793159809.

The spelling of 3988507421 in words is "three billion, nine hundred eighty-eight million, five hundred seven thousand, four hundred twenty-one".