1825640 has 16 divisors (see below), whose sum is σ = 4107780. Its totient is φ = 730240.

The previous prime is 1825631. The next prime is 1825661. The reversal of 1825640 is 465281.

It can be written as a sum of positive squares in 2 ways, for example, as 1811716 + 13924 = 1346^2 + 118^2 .

It is a super-2 number, since 2×1825640² = 6665922819200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22781 + ... + 22860.

2^1825640 is an apocalyptic number.

1825640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1825640 is an abundant number, since it is smaller than the sum of its proper divisors (2282140).

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

1825640 is a wasteful number, since it uses less digits than its factorization.

1825640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45652 (or 45648 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1825640 is about 1351.1624624744. The cubic root of 1825640 is about 122.2189028789.

The spelling of 1825640 in words is "one million, eight hundred twenty-five thousand, six hundred forty".