1261807 has 4 divisors (see below), whose sum is σ = 1264120. Its totient is φ = 1259496.

The previous prime is 1261801. The next prime is 1261823. The reversal of 1261807 is 7081621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7081621 = 109 ⋅64969.

It is a cyclic number.

It is not a de Polignac number, because 1261807 - 2¹¹ = 1259759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261801) 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 3 ways as a sum of consecutive naturals, for example, 169 + ... + 1597.

It is an arithmetic number, because the mean of its divisors is an integer number (316030).

2^1261807 is an apocalyptic number.

1261807 is a deficient number, since it is larger than the sum of its proper divisors (2313).

1261807 is an equidigital number, since it uses as much as digits as its factorization.

1261807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1261807 is about 1123.3018294297. The cubic root of 1261807 is about 108.0598376683.

The spelling of 1261807 in words is "one million, two hundred sixty-one thousand, eight hundred seven".