1261994 has 4 divisors (see below), whose sum is σ = 1892994. Its totient is φ = 630996.

The previous prime is 1261973. The next prime is 1262011. The reversal of 1261994 is 4991621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4991621 = 23 ⋅217027.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 18769 = 1115^2 + 137^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1261994.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315497 + ... + 315500.

2^1261994 is an apocalyptic number.

1261994 is a deficient number, since it is larger than the sum of its proper divisors (631000).

1261994 is an equidigital number, since it uses as much as digits as its factorization.

1261994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630999.

The product of its digits is 3888, while the sum is 32.

The square root of 1261994 is about 1123.3850631017. The cubic root of 1261994 is about 108.0651755664.

The spelling of 1261994 in words is "one million, two hundred sixty-one thousand, nine hundred ninety-four".