23767981 has 2 divisors, whose sum is σ = 23767982. Its totient is φ = 23767980.

The previous prime is 23767967. The next prime is 23767999. The reversal of 23767981 is 18976732.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22410756 + 1357225 = 4734^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 23767981 - 2¹³ = 23759789 is a prime.

It is a super-2 number, since 2×23767981² = 1129833841632722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23767481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11883990 + 11883991.

It is an arithmetic number, because the mean of its divisors is an integer number (11883991).

Almost surely, 2^23767981 is an apocalyptic number.

It is an amenable number.

23767981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23767981 is an equidigital number, since it uses as much as digits as its factorization.

23767981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 43.

The square root of 23767981 is about 4875.2416350372. The cubic root of 23767981 is about 287.5173766435.

The spelling of 23767981 in words is "twenty-three million, seven hundred sixty-seven thousand, nine hundred eighty-one".