381421 has 4 divisors (see below), whose sum is σ = 383292. Its totient is φ = 379552.

The previous prime is 381419. The next prime is 381439. The reversal of 381421 is 124183.

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 38025 + 343396 = 195^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 381421 - 2¹ = 381419 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 (381401) 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, 586 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (95823).

2³⁸¹⁴²¹ is an apocalyptic number.

It is an amenable number.

381421 is a deficient number, since it is larger than the sum of its proper divisors (1871).

381421 is a wasteful number, since it uses less digits than its factorization.

381421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1870.

The product of its digits is 192, while the sum is 19.

The square root of 381421 is about 617.5929079904. The cubic root of 381421 is about 72.5217374375.

The spelling of 381421 in words is "three hundred eighty-one thousand, four hundred twenty-one".