1285994 has 4 divisors (see below), whose sum is σ = 1928994. Its totient is φ = 642996.

The previous prime is 1285993. The next prime is 1286011. The reversal of 1285994 is 4995821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4995821 = 149 ⋅33529.

It can be written as a sum of positive squares in only one way, i.e., 1129969 + 156025 = 1063^2 + 395^2 .

It is not an unprimeable number, because it can be changed into a prime (1285993) by changing a digit.

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 as a sum of consecutive naturals, namely, 321497 + ... + 321500.

2^1285994 is an apocalyptic number.

1285994 is a deficient number, since it is larger than the sum of its proper divisors (643000).

1285994 is an equidigital number, since it uses as much as digits as its factorization.

1285994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642999.

The product of its digits is 25920, while the sum is 38.

The square root of 1285994 is about 1134.0167547263. The cubic root of 1285994 is about 108.7459222499.

Subtracting from 1285994 its sum of digits (38), we obtain a square (1285956 = 1134²).

The spelling of 1285994 in words is "one million, two hundred eighty-five thousand, nine hundred ninety-four".