18439476 has 48 divisors (see below), whose sum is σ = 48565440. Its totient is φ = 5393920.

The previous prime is 18439471. The next prime is 18439483. The reversal of 18439476 is 67493481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18439471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1420 + ... + 6236.

It is an arithmetic number, because the mean of its divisors is an integer number (1011780).

Almost surely, 2^18439476 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18439476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24282720).

18439476 is an abundant number, since it is smaller than the sum of its proper divisors (30125964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18439476 is a wasteful number, since it uses less digits than its factorization.

18439476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4864 (or 4862 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 18439476 is about 4294.1210975006. The cubic root of 18439476 is about 264.1898886376.

It can be divided in two parts, 18439 and 476, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 18439476 in words is "eighteen million, four hundred thirty-nine thousand, four hundred seventy-six".