1261799 has 12 divisors (see below), whose sum is σ = 1601928. Its totient is φ = 982800.

The previous prime is 1261789. The next prime is 1261801. The reversal of 1261799 is 9971621.

1261799 = T₂₀₂ + T₂₀₃ + ... + T₂₅₀.

It is not a de Polignac number, because 1261799 - 2²⁰ = 213223 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 (1261739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 632 + ... + 1709.

It is an arithmetic number, because the mean of its divisors is an integer number (133494).

2^1261799 is an apocalyptic number.

1261799 is a deficient number, since it is larger than the sum of its proper divisors (340129).

1261799 is a wasteful number, since it uses less digits than its factorization.

1261799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366 (or 2359 counting only the distinct ones).

The product of its digits is 6804, while the sum is 35.

The square root of 1261799 is about 1123.2982684933. The cubic root of 1261799 is about 108.0596092972.

The spelling of 1261799 in words is "one million, two hundred sixty-one thousand, seven hundred ninety-nine".