1025840 has 20 divisors (see below), whose sum is σ = 2385264. Its totient is φ = 410304.

The previous prime is 1025839. The next prime is 1025873. The reversal of 1025840 is 485201.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 16.

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 3 ways as a sum of consecutive naturals, for example, 6332 + ... + 6491.

2^1025840 is an apocalyptic number.

1025840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1025840 is an abundant number, since it is smaller than the sum of its proper divisors (1359424).

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

1025840 is a wasteful number, since it uses less digits than its factorization.

1025840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12836 (or 12830 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1025840 is about 1012.8375980383. The cubic root of 1025840 is about 100.8540190848.

The spelling of 1025840 in words is "one million, twenty-five thousand, eight hundred forty".