1858401 has 6 divisors (see below), whose sum is σ = 2684370. Its totient is φ = 1238928.

The previous prime is 1858369. The next prime is 1858403. The reversal of 1858401 is 1048581.

It can be written as a sum of positive squares in only one way, i.e., 1782225 + 76176 = 1335^2 + 276^2 .

It is not a de Polignac number, because 1858401 - 2⁵ = 1858369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1858403) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 103236 + ... + 103253.

It is an arithmetic number, because the mean of its divisors is an integer number (447395).

2^1858401 is an apocalyptic number.

It is an amenable number.

1858401 is a deficient number, since it is larger than the sum of its proper divisors (825969).

1858401 is a wasteful number, since it uses less digits than its factorization.

1858401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206495 (or 206492 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 1858401 is about 1363.2318218117. The cubic root of 1858401 is about 122.9456432435.

The spelling of 1858401 in words is "one million, eight hundred fifty-eight thousand, four hundred one".