1423840 has 48 divisors (see below), whose sum is σ = 3674160. Its totient is φ = 517120.

The previous prime is 1423819. The next prime is 1423843. The reversal of 1423840 is 483241.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423843) by changing a digit.

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, 1356 + ... + 2164.

It is an arithmetic number, because the mean of its divisors is an integer number (76545).

2^1423840 is an apocalyptic number.

1423840 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 1423840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1837080).

1423840 is an abundant number, since it is smaller than the sum of its proper divisors (2250320).

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

1423840 is a wasteful number, since it uses less digits than its factorization.

1423840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1423840 is about 1193.2476691785. The cubic root of 1423840 is about 112.5003127563.

The spelling of 1423840 in words is "one million, four hundred twenty-three thousand, eight hundred forty".