18447963 has 4 divisors (see below), whose sum is σ = 24597288. Its totient is φ = 12298640.

The previous prime is 18447929. The next prime is 18447967. The reversal of 18447963 is 36974481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36974481 = 3 ⋅12324827.

It is a cyclic number.

It is not a de Polignac number, because 18447963 - 2⁶ = 18447899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18447967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3074658 + ... + 3074663.

It is an arithmetic number, because the mean of its divisors is an integer number (6149322).

Almost surely, 2^18447963 is an apocalyptic number.

18447963 is a deficient number, since it is larger than the sum of its proper divisors (6149325).

18447963 is an equidigital number, since it uses as much as digits as its factorization.

18447963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6149324.

The product of its digits is 145152, while the sum is 42.

The square root of 18447963 is about 4295.1091953523. The cubic root of 18447963 is about 264.2304146568.

The spelling of 18447963 in words is "eighteen million, four hundred forty-seven thousand, nine hundred sixty-three".