1236981 has 12 divisors (see below), whose sum is σ = 1696128. Its totient is φ = 801864.

The previous prime is 1236979. The next prime is 1237001. The reversal of 1236981 is 1896321.

It is not a de Polignac number, because 1236981 - 2¹ = 1236979 is a prime.

It is a super-2 number, since 2×1236981² = 3060243988722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1236901) 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, 5436 + ... + 5658.

It is an arithmetic number, because the mean of its divisors is an integer number (141344).

2^1236981 is an apocalyptic number.

It is an amenable number.

1236981 is a deficient number, since it is larger than the sum of its proper divisors (459147).

1236981 is an equidigital number, since it uses as much as digits as its factorization.

1236981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 269 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 1236981 is about 1112.1964754485. The cubic root of 1236981 is about 107.3464474372.

The spelling of 1236981 in words is "one million, two hundred thirty-six thousand, nine hundred eighty-one".