18923953 has 2 divisors, whose sum is σ = 18923954. Its totient is φ = 18923952.

The previous prime is 18923929. The next prime is 18923987. The reversal of 18923953 is 35932981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 2537649 = 4048^2 + 1593^2 .

It is a cyclic number.

It is not a de Polignac number, because 18923953 - 2⁹ = 18923441 is a prime.

It is not a weakly prime, because it can be changed into another prime (18923903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9461976 + 9461977.

It is an arithmetic number, because the mean of its divisors is an integer number (9461977).

Almost surely, 2^18923953 is an apocalyptic number.

It is an amenable number.

18923953 is a deficient number, since it is larger than the sum of its proper divisors (1).

18923953 is an equidigital number, since it uses as much as digits as its factorization.

18923953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 18923953 is about 4350.1670082883. The cubic root of 18923953 is about 266.4836819312.

Subtracting 18923953 from its reverse (35932981), we obtain a triangular number (17009028 = T₅₈₃₂).

It can be divided in two parts, 189 and 23953, that added together give a palindrome (24142).

The spelling of 18923953 in words is "eighteen million, nine hundred twenty-three thousand, nine hundred fifty-three".