8406981 has 12 divisors (see below), whose sum is σ = 13247520. Its totient is φ = 5095080.

The previous prime is 8406977. The next prime is 8406991. The reversal of 8406981 is 1896048.

It is a happy number.

It is not a de Polignac number, because 8406981 - 2² = 8406977 is a prime.

It is a super-2 number, since 2×8406981² = 141354659068722, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8406901) 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, 42361 + ... + 42558.

It is an arithmetic number, because the mean of its divisors is an integer number (1103960).

Almost surely, 2^8406981 is an apocalyptic number.

It is an amenable number.

8406981 is a deficient number, since it is larger than the sum of its proper divisors (4840539).

8406981 is a wasteful number, since it uses less digits than its factorization.

8406981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84936 (or 84933 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 8406981 is about 2899.4794360368. The cubic root of 8406981 is about 203.3355689682.

The spelling of 8406981 in words is "eight million, four hundred six thousand, nine hundred eighty-one".