18877449 has 4 divisors (see below), whose sum is σ = 25169936. Its totient is φ = 12584964.

The previous prime is 18877447. The next prime is 18877483. The reversal of 18877449 is 94477881.

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: 94477881 = 3 ⋅31492627.

It is not a de Polignac number, because 18877449 - 2¹ = 18877447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18877398 and 18877407.

It is not an unprimeable number, because it can be changed into a prime (18877447) 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, 3146239 + ... + 3146244.

It is an arithmetic number, because the mean of its divisors is an integer number (6292484).

Almost surely, 2^18877449 is an apocalyptic number.

It is an amenable number.

18877449 is a deficient number, since it is larger than the sum of its proper divisors (6292487).

18877449 is an equidigital number, since it uses as much as digits as its factorization.

18877449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6292486.

The product of its digits is 451584, while the sum is 48.

The square root of 18877449 is about 4344.8186383323. The cubic root of 18877449 is about 266.2652159084.

The spelling of 18877449 in words is "eighteen million, eight hundred seventy-seven thousand, four hundred forty-nine".