18563942 has 4 divisors (see below), whose sum is σ = 27845916. Its totient is φ = 9281970.

The previous prime is 18563933. The next prime is 18563981. The reversal of 18563942 is 24936581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24936581 = 73 ⋅341597.

It is a junction number, because it is equal to n+sod(n) for n = 18563896 and 18563905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4640984 + ... + 4640987.

It is an arithmetic number, because the mean of its divisors is an integer number (6961479).

Almost surely, 2^18563942 is an apocalyptic number.

18563942 is a deficient number, since it is larger than the sum of its proper divisors (9281974).

18563942 is an equidigital number, since it uses as much as digits as its factorization.

18563942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9281973.

The product of its digits is 51840, while the sum is 38.

The square root of 18563942 is about 4308.5893283069. The cubic root of 18563942 is about 264.7829812174.

The spelling of 18563942 in words is "eighteen million, five hundred sixty-three thousand, nine hundred forty-two".