11926981 has 8 divisors (see below), whose sum is σ = 13062528. Its totient is φ = 10800000.

The previous prime is 11926963. The next prime is 11926991. The reversal of 11926981 is 18962911.

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

It is a 5-Lehmer number, since φ(11926981) divides (11926981-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 11926981 - 2⁷ = 11926853 is a prime.

It is a super-2 number, since 2×11926981² = 284505751548722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11926981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11926921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981 + ... + 4981.

It is an arithmetic number, because the mean of its divisors is an integer number (1632816).

Almost surely, 2^11926981 is an apocalyptic number.

11926981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11926981 is a deficient number, since it is larger than the sum of its proper divisors (1135547).

11926981 is a wasteful number, since it uses less digits than its factorization.

11926981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4283.

The product of its digits is 7776, while the sum is 37.

The square root of 11926981 is about 3453.5461485262. The cubic root of 11926981 is about 228.4775373859.

The spelling of 11926981 in words is "eleven million, nine hundred twenty-six thousand, nine hundred eighty-one".