18858953 has 4 divisors (see below), whose sum is σ = 18901968. Its totient is φ = 18815940.

The previous prime is 18858947. The next prime is 18858971. The reversal of 18858953 is 35985881.

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: 35985881 = 491 ⋅73291.

It is a cyclic number.

It is not a de Polignac number, because 18858953 - 2¹⁰ = 18857929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18858898 and 18858907.

It is not an unprimeable number, because it can be changed into a prime (18858923) 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, 20843 + ... + 21728.

It is an arithmetic number, because the mean of its divisors is an integer number (4725492).

Almost surely, 2^18858953 is an apocalyptic number.

It is an amenable number.

18858953 is a deficient number, since it is larger than the sum of its proper divisors (43015).

18858953 is an equidigital number, since it uses as much as digits as its factorization.

18858953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43014.

The product of its digits is 345600, while the sum is 47.

The square root of 18858953 is about 4342.6896043811. The cubic root of 18858953 is about 266.1782258574.

The spelling of 18858953 in words is "eighteen million, eight hundred fifty-eight thousand, nine hundred fifty-three".