18563941 has 6 divisors (see below), whose sum is σ = 20405126. Its totient is φ = 16876200.

The previous prime is 18563933. The next prime is 18563981. The reversal of 18563941 is 14936581.

It can be written as a sum of positive squares in only one way, i.e., 13176900 + 5387041 = 3630^2 + 2321^2 .

It is not a de Polignac number, because 18563941 - 2³ = 18563933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18563941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18563981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76590 + ... + 76831.

Almost surely, 2^18563941 is an apocalyptic number.

18563941 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18563941 is a deficient number, since it is larger than the sum of its proper divisors (1841185).

18563941 is a wasteful number, since it uses less digits than its factorization.

18563941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153443 (or 153432 counting only the distinct ones).

The product of its digits is 25920, while the sum is 37.

The square root of 18563941 is about 4308.5892122596. The cubic root of 18563941 is about 264.7829764630.

The spelling of 18563941 in words is "eighteen million, five hundred sixty-three thousand, nine hundred forty-one".