1381424 has 40 divisors (see below), whose sum is σ = 2999808. Its totient is φ = 610880.

The previous prime is 1381421. The next prime is 1381427. The reversal of 1381424 is 4241831.

It is an interprime number because it is at equal distance from previous prime (1381421) and next prime (1381427).

It is a self number, because there is not a number n which added to its sum of digits gives 1381424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8189 + ... + 8355.

2^1381424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1499904).

1381424 is an abundant number, since it is smaller than the sum of its proper divisors (1618384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381424 is a wasteful number, since it uses less digits than its factorization.

1381424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 227 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 1381424 is about 1175.3399508227. The cubic root of 1381424 is about 111.3719094532.

The spelling of 1381424 in words is "one million, three hundred eighty-one thousand, four hundred twenty-four".