388421 has 4 divisors (see below), whose sum is σ = 423744. Its totient is φ = 353100.

The previous prime is 388403. The next prime is 388459. The reversal of 388421 is 124883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124883 = 11 ⋅11353.

It is not a de Polignac number, because 388421 - 2¹⁰ = 387397 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17645 + ... + 17666.

It is an arithmetic number, because the mean of its divisors is an integer number (105936).

2³⁸⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

388421 is a deficient number, since it is larger than the sum of its proper divisors (35323).

388421 is a wasteful number, since it uses less digits than its factorization.

388421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35322.

The product of its digits is 1536, while the sum is 26.

The square root of 388421 is about 623.2343058594. The cubic root of 388421 is about 72.9627006549.

The spelling of 388421 in words is "three hundred eighty-eight thousand, four hundred twenty-one".