1994558 has 4 divisors (see below), whose sum is σ = 2991840. Its totient is φ = 997278.

The previous prime is 1994543. The next prime is 1994567. The reversal of 1994558 is 8554991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8554991 = 2081 ⋅4111.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498638 + ... + 498641.

It is an arithmetic number, because the mean of its divisors is an integer number (747960).

2^1994558 is an apocalyptic number.

1994558 is a deficient number, since it is larger than the sum of its proper divisors (997282).

1994558 is an equidigital number, since it uses as much as digits as its factorization.

1994558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997281.

The product of its digits is 64800, while the sum is 41.

The square root of 1994558 is about 1412.2882142112. The cubic root of 1994558 is about 125.8777263460.

It can be divided in two parts, 1994 and 558, that added together give a palindrome (2552).

The spelling of 1994558 in words is "one million, nine hundred ninety-four thousand, five hundred fifty-eight".