1425840 has 80 divisors (see below), whose sum is σ = 4770528. Its totient is φ = 350208.

The previous prime is 1425821. The next prime is 1425863. The reversal of 1425840 is 485241.

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 (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1425840.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2892 + ... + 3348.

2^1425840 is an apocalyptic number.

1425840 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 1425840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2385264).

1425840 is an abundant number, since it is smaller than the sum of its proper divisors (3344688).

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

1425840 is a wasteful number, since it uses less digits than its factorization.

1425840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 1425840 is about 1194.0854240799. The cubic root of 1425840 is about 112.5529627166.

The spelling of 1425840 in words is "one million, four hundred twenty-five thousand, eight hundred forty".