1440420 has 24 divisors (see below), whose sum is σ = 4033344. Its totient is φ = 384096.

The previous prime is 1440419. The next prime is 1440437. The reversal of 1440420 is 240441.

Added to its reverse (240441) it gives a triangular number (1680861 = T₁₈₃₃).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1440420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11944 + ... + 12063.

It is an arithmetic number, because the mean of its divisors is an integer number (168056).

2^1440420 is an apocalyptic number.

1440420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1440420 is an abundant number, since it is smaller than the sum of its proper divisors (2592924).

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

1440420 is a wasteful number, since it uses less digits than its factorization.

1440420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24019 (or 24017 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1440420 is about 1200.1749872414. The cubic root of 1440420 is about 112.9353011522.

Adding to 1440420 its reverse (240441), we get a palindrome (1680861).

The spelling of 1440420 in words is "one million, four hundred forty thousand, four hundred twenty".