8423981 has 8 divisors (see below), whose sum is σ = 8602944. Its totient is φ = 8246880.

The previous prime is 8423953. The next prime is 8423999. The reversal of 8423981 is 1893248.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8423981 - 2¹⁸ = 8161837 is a prime.

It is a super-2 number, since 2×8423981² = 141926911776722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8423281) 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, 11846 + ... + 12536.

It is an arithmetic number, because the mean of its divisors is an integer number (1075368).

Almost surely, 2^8423981 is an apocalyptic number.

It is an amenable number.

8423981 is a deficient number, since it is larger than the sum of its proper divisors (178963).

8423981 is a wasteful number, since it uses less digits than its factorization.

8423981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its digits is 13824, while the sum is 35.

The square root of 8423981 is about 2902.4095162468. The cubic root of 8423981 is about 203.4725336059.

The spelling of 8423981 in words is "eight million, four hundred twenty-three thousand, nine hundred eighty-one".