1438440 has 32 divisors (see below), whose sum is σ = 4315680. Its totient is φ = 383552.

The previous prime is 1438417. The next prime is 1438447. The reversal of 1438440 is 448341.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1438440.

It is not an unprimeable number, because it can be changed into a prime (1438447) 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, 5874 + ... + 6113.

It is an arithmetic number, because the mean of its divisors is an integer number (134865).

2^1438440 is an apocalyptic number.

1438440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1438440 is an abundant number, since it is smaller than the sum of its proper divisors (2877240).

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

1438440 is a wasteful number, since it uses less digits than its factorization.

1438440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12001 (or 11997 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 1438440 is about 1199.3498238629. The cubic root of 1438440 is about 112.8835305035.

Subtracting from 1438440 its reverse (448341), we obtain a palindrome (990099).

The spelling of 1438440 in words is "one million, four hundred thirty-eight thousand, four hundred forty".