1858840 has 16 divisors (see below), whose sum is σ = 4182480. Its totient is φ = 743520.

The previous prime is 1858823. The next prime is 1858849. The reversal of 1858840 is 488581.

1858840 = 345² + 346² + ... + 359².

It is a super-2 number, since 2×1858840² = 6910572291200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1858796 and 1858805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1858849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23196 + ... + 23275.

It is an arithmetic number, because the mean of its divisors is an integer number (261405).

2^1858840 is an apocalyptic number.

1858840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1858840 is an abundant number, since it is smaller than the sum of its proper divisors (2323640).

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

1858840 is a wasteful number, since it uses less digits than its factorization.

1858840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46482 (or 46478 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 1858840 is about 1363.3928267378. The cubic root of 1858840 is about 122.9553234090.

It can be divided in two parts, 185 and 8840, that added together give a square (9025 = 95²).

The spelling of 1858840 in words is "one million, eight hundred fifty-eight thousand, eight hundred forty".