1231994 has 4 divisors (see below), whose sum is σ = 1847994. Its totient is φ = 615996.

The previous prime is 1231987. The next prime is 1231999. The reversal of 1231994 is 4991321.

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: 4991321 = 137 ⋅36433.

It can be written as a sum of positive squares in only one way, i.e., 877969 + 354025 = 937^2 + 595^2 .

It is not an unprimeable number, because it can be changed into a prime (1231999) 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 as a sum of consecutive naturals, namely, 307997 + ... + 308000.

2^1231994 is an apocalyptic number.

1231994 is a deficient number, since it is larger than the sum of its proper divisors (616000).

1231994 is an equidigital number, since it uses as much as digits as its factorization.

1231994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615999.

The product of its digits is 1944, while the sum is 29.

The square root of 1231994 is about 1109.9522512252. The cubic root of 1231994 is about 107.2019941895.

The spelling of 1231994 in words is "one million, two hundred thirty-one thousand, nine hundred ninety-four".