18874857 has 4 divisors (see below), whose sum is σ = 25166480. Its totient is φ = 12583236.

The previous prime is 18874831. The next prime is 18874859. The reversal of 18874857 is 75847881.

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: 75847881 = 3 ⋅25282627.

It is not a de Polignac number, because 18874857 - 2¹¹ = 18872809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18874859) 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, 3145807 + ... + 3145812.

It is an arithmetic number, because the mean of its divisors is an integer number (6291620).

Almost surely, 2^18874857 is an apocalyptic number.

It is an amenable number.

18874857 is a deficient number, since it is larger than the sum of its proper divisors (6291623).

18874857 is an equidigital number, since it uses as much as digits as its factorization.

18874857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6291622.

The product of its digits is 501760, while the sum is 48.

The square root of 18874857 is about 4344.5203417639. The cubic root of 18874857 is about 266.2530286856.

It can be divided in two parts, 188748 and 57, that added together give a triangular number (188805 = T₆₁₄).

The spelling of 18874857 in words is "eighteen million, eight hundred seventy-four thousand, eight hundred fifty-seven".