1423440 has 80 divisors (see below), whose sum is σ = 4910400. Its totient is φ = 379008.

The previous prime is 1423439. The next prime is 1423441. The reversal of 1423440 is 443241.

It is an interprime number because it is at equal distance from previous prime (1423439) and next prime (1423441).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1831 + ... + 2489.

It is an arithmetic number, because the mean of its divisors is an integer number (61380).

2^1423440 is an apocalyptic number.

1423440 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 1423440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2455200).

1423440 is an abundant number, since it is smaller than the sum of its proper divisors (3486960).

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

1423440 is a wasteful number, since it uses less digits than its factorization.

1423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 1423440 is about 1193.0800476079. The cubic root of 1423440 is about 112.4897768488.

Adding to 1423440 its reverse (443241), we get a palindrome (1866681).

The spelling of 1423440 in words is "one million, four hundred twenty-three thousand, four hundred forty".