1440138 has 32 divisors (see below), whose sum is σ = 3487104. Its totient is φ = 387072.

The previous prime is 1440119. The next prime is 1440203. The reversal of 1440138 is 8310441.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295 + ... + 1722.

It is an arithmetic number, because the mean of its divisors is an integer number (108972).

2^1440138 is an apocalyptic number.

1440138 is an abundant number, since it is smaller than the sum of its proper divisors (2046966).

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

1440138 is a wasteful number, since it uses less digits than its factorization.

1440138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046.

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

The square root of 1440138 is about 1200.0574986225. The cubic root of 1440138 is about 112.9279306553.

Adding to 1440138 its reverse (8310441), we get a palindrome (9750579).

The spelling of 1440138 in words is "one million, four hundred forty thousand, one hundred thirty-eight".