1420240 has 40 divisors (see below), whose sum is σ = 3390408. Its totient is φ = 552960.

The previous prime is 1420207. The next prime is 1420253. The reversal of 1420240 is 420241.

It can be written as a sum of positive squares in 4 ways, for example, as 46656 + 1373584 = 216^2 + 1172^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1420240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3064 + ... + 3496.

2^1420240 is an apocalyptic number.

1420240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1420240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1695204).

1420240 is an abundant number, since it is smaller than the sum of its proper divisors (1970168).

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

1420240 is a wasteful number, since it uses less digits than its factorization.

1420240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 481 counting only the distinct ones).

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

The square root of 1420240 is about 1191.7382262896. The cubic root of 1420240 is about 112.4054184476.

Adding to 1420240 its reverse (420241), we get a palindrome (1840481).

Subtracting from 1420240 its reverse (420241), we obtain a palindrome (999999).

The spelling of 1420240 in words is "one million, four hundred twenty thousand, two hundred forty".