1440381 has 8 divisors (see below), whose sum is σ = 1956960. Its totient is φ = 942032.

The previous prime is 1440379. The next prime is 1440391. The reversal of 1440381 is 1830441.

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 1440381 - 2¹ = 1440379 is a prime.

It is a super-2 number, since 2×1440381² = 4149394850322, which contains 22 as substring.

It is a Curzon number.

1440381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440301) 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, 4371 + ... + 4688.

It is an arithmetic number, because the mean of its divisors is an integer number (244620).

2^1440381 is an apocalyptic number.

It is an amenable number.

1440381 is a deficient number, since it is larger than the sum of its proper divisors (516579).

1440381 is an equidigital number, since it uses as much as digits as its factorization.

1440381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9115.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1440381 is about 1200.1587395007. The cubic root of 1440381 is about 112.9342818855.

The spelling of 1440381 in words is "one million, four hundred forty thousand, three hundred eighty-one".