1261836 has 18 divisors (see below), whose sum is σ = 3189732. Its totient is φ = 420600.

The previous prime is 1261831. The next prime is 1261837. The reversal of 1261836 is 6381621.

1261836 is a `hidden beast` number, since 12 + 618 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (1261831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17490 + ... + 17561.

2^1261836 is an apocalyptic number.

It is an amenable number.

1261836 is an abundant number, since it is smaller than the sum of its proper divisors (1927896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261836 is a wasteful number, since it uses less digits than its factorization.

1261836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35061 (or 35056 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1261836 is about 1123.3147377294. The cubic root of 1261836 is about 108.0606655052.

The spelling of 1261836 in words is "one million, two hundred sixty-one thousand, eight hundred thirty-six".