18439452 has 18 divisors (see below), whose sum is σ = 46610928. Its totient is φ = 6146472.

The previous prime is 18439439. The next prime is 18439457. The reversal of 18439452 is 25493481.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 512207 = 18439452 / (1 + 8 + 4 + 3 + 9 + 4 + 5 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18439457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256068 + ... + 256139.

It is an arithmetic number, because the mean of its divisors is an integer number (2589496).

Almost surely, 2^18439452 is an apocalyptic number.

18439452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18439452 is an abundant number, since it is smaller than the sum of its proper divisors (28171476).

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

18439452 is a wasteful number, since it uses less digits than its factorization.

18439452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512217 (or 512212 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 18439452 is about 4294.1183029814. The cubic root of 18439452 is about 264.1897740183.

The spelling of 18439452 in words is "eighteen million, four hundred thirty-nine thousand, four hundred fifty-two".