1421440 has 32 divisors (see below), whose sum is σ = 3399660. Its totient is φ = 568320.

The previous prime is 1421437. The next prime is 1421449. The reversal of 1421440 is 441241.

It can be written as a sum of positive squares in 2 ways, for example, as 1420864 + 576 = 1192^2 + 24^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1421449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471 + ... + 1750.

2^1421440 is an apocalyptic number.

1421440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421440 is an abundant number, since it is smaller than the sum of its proper divisors (1978220).

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

1421440 is an equidigital number, since it uses as much as digits as its factorization.

1421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240 (or 2228 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1421440 is about 1192.2415862567. The cubic root of 1421440 is about 112.4370676830.

Adding to 1421440 its reverse (441241), we get a palindrome (1862681).

It can be divided in two parts, 142 and 1440, that multiplied together give a triangular number (204480 = T₆₃₉).

The spelling of 1421440 in words is "one million, four hundred twenty-one thousand, four hundred forty".