1431381 has 8 divisors (see below), whose sum is σ = 2181184. Its totient is φ = 817920.

The previous prime is 1431379. The next prime is 1431389. The reversal of 1431381 is 1831341.

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

It is not a de Polignac number, because 1431381 - 2¹ = 1431379 is a prime.

It is a super-2 number, since 2×1431381² = 4097703134322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 68161 = 1431381 / (1 + 4 + 3 + 1 + 3 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1431389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34060 + ... + 34101.

It is an arithmetic number, because the mean of its divisors is an integer number (272648).

2^1431381 is an apocalyptic number.

It is an amenable number.

1431381 is a deficient number, since it is larger than the sum of its proper divisors (749803).

1431381 is an equidigital number, since it uses as much as digits as its factorization.

1431381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68171.

The product of its digits is 288, while the sum is 21.

The square root of 1431381 is about 1196.4033600755. The cubic root of 1431381 is about 112.6985727516.

The spelling of 1431381 in words is "one million, four hundred thirty-one thousand, three hundred eighty-one".