18942553 has 4 divisors (see below), whose sum is σ = 21648640. Its totient is φ = 16236468.

The previous prime is 18942523. The next prime is 18942559. The reversal of 18942553 is 35524981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35524981 = 953 ⋅37277.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18942553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18942559) 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, 1353033 + ... + 1353046.

It is an arithmetic number, because the mean of its divisors is an integer number (5412160).

Almost surely, 2^18942553 is an apocalyptic number.

It is an amenable number.

18942553 is a deficient number, since it is larger than the sum of its proper divisors (2706087).

18942553 is an equidigital number, since it uses as much as digits as its factorization.

18942553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2706086.

The product of its digits is 43200, while the sum is 37.

The square root of 18942553 is about 4352.3043321900. The cubic root of 18942553 is about 266.5709606207.

The spelling of 18942553 in words is "eighteen million, nine hundred forty-two thousand, five hundred fifty-three".