3988421 has 4 divisors (see below), whose sum is σ = 4223052. Its totient is φ = 3753792.

The previous prime is 3988403. The next prime is 3988427. The reversal of 3988421 is 1248893.

It is a happy number.

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 1060900 + 2927521 = 1030^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 3988421 - 2¹⁴ = 3972037 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 (3988427) 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, 117290 + ... + 117323.

It is an arithmetic number, because the mean of its divisors is an integer number (1055763).

Almost surely, 2^3988421 is an apocalyptic number.

It is an amenable number.

3988421 is a deficient number, since it is larger than the sum of its proper divisors (234631).

3988421 is a wasteful number, since it uses less digits than its factorization.

3988421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234630.

The product of its digits is 13824, while the sum is 35.

The square root of 3988421 is about 1997.1031520680. The cubic root of 3988421 is about 158.5867861883.

The spelling of 3988421 in words is "three million, nine hundred eighty-eight thousand, four hundred twenty-one".