1858640 has 40 divisors (see below), whose sum is σ = 4940160. Its totient is φ = 637056.

The previous prime is 1858631. The next prime is 1858643. The reversal of 1858640 is 468581.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1858597 and 1858606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1858643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1100 + ... + 2219.

It is an arithmetic number, because the mean of its divisors is an integer number (123504).

2^1858640 is an apocalyptic number.

1858640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1858640 is an abundant number, since it is smaller than the sum of its proper divisors (3081520).

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

1858640 is a wasteful number, since it uses less digits than its factorization.

1858640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3339 (or 3333 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1858640 is about 1363.3194783322. The cubic root of 1858640 is about 122.9509134999.

The spelling of 1858640 in words is "one million, eight hundred fifty-eight thousand, six hundred forty".