1421381 has 8 divisors (see below), whose sum is σ = 1580544. Its totient is φ = 1269360.

The previous prime is 1421351. The next prime is 1421389. The reversal of 1421381 is 1831241.

1421381 is nontrivially palindromic in base 12.

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

It is a cyclic number.

It is not a de Polignac number, because 1421381 - 2⁶ = 1421317 is a prime.

It is a super-2 number, since 2×1421381² = 4040647894322, which contains 22 as substring.

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 (1421389) 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, 1361 + ... + 2166.

It is an arithmetic number, because the mean of its divisors is an integer number (197568).

2^1421381 is an apocalyptic number.

It is an amenable number.

1421381 is a deficient number, since it is larger than the sum of its proper divisors (159163).

1421381 is a wasteful number, since it uses less digits than its factorization.

1421381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571.

The product of its digits is 192, while the sum is 20.

The square root of 1421381 is about 1192.2168426926. The cubic root of 1421381 is about 112.4355120120.

The spelling of 1421381 in words is "one million, four hundred twenty-one thousand, three hundred eighty-one".