1440004 has 12 divisors (see below), whose sum is σ = 2537164. Its totient is φ = 715104.

The previous prime is 1439989. The next prime is 1440011. The reversal of 1440004 is 4000441.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 419904 + 1020100 = 648^2 + 1010^2 .

It is a super-2 number, since 2×1440004² = 4147223040032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519 + ... + 1774.

2^1440004 is an apocalyptic number.

It is an amenable number.

1440004 is a deficient number, since it is larger than the sum of its proper divisors (1097160).

1440004 is a wasteful number, since it uses less digits than its factorization.

1440004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454 (or 2452 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 1440004 is about 1200.0016666655. The cubic root of 1440004 is about 112.9244280252.

Adding to 1440004 its reverse (4000441), we get a palindrome (5440445).

The spelling of 1440004 in words is "one million, four hundred forty thousand, four".