11406981 has 8 divisors (see below), whose sum is σ = 15275520. Its totient is φ = 7571552.

The previous prime is 11406971. The next prime is 11406991. The reversal of 11406981 is 18960411.

It is an interprime number because it is at equal distance from previous prime (11406971) and next prime (11406991).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11406981 is a prime.

It is a super-2 number, since 2×11406981² = 260238431068722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11406961) 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 7 ways as a sum of consecutive naturals, for example, 7461 + ... + 8858.

It is an arithmetic number, because the mean of its divisors is an integer number (1909440).

Almost surely, 2^11406981 is an apocalyptic number.

It is an amenable number.

11406981 is a deficient number, since it is larger than the sum of its proper divisors (3868539).

11406981 is a wasteful number, since it uses less digits than its factorization.

11406981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16555.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 11406981 is about 3377.4222418880. The cubic root of 11406981 is about 225.1076423218.

The spelling of 11406981 in words is "eleven million, four hundred six thousand, nine hundred eighty-one".