18012424 has 8 divisors (see below), whose sum is σ = 33773310. Its totient is φ = 9006208.

The previous prime is 18012419. The next prime is 18012431. The reversal of 18012424 is 42421081.

It can be written as a sum of positive squares in only one way, i.e., 17791524 + 220900 = 4218^2 + 470^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 18012395 and 18012404.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1125769 + ... + 1125784.

Almost surely, 2^18012424 is an apocalyptic number.

It is an amenable number.

18012424 is a deficient number, since it is larger than the sum of its proper divisors (15760886).

18012424 is a wasteful number, since it uses less digits than its factorization.

18012424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251559 (or 2251555 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 18012424 is about 4244.1046169952. The cubic root of 18012424 is about 262.1344220185.

It can be divided in two parts, 1801 and 2424, that added together give a square (4225 = 65²).

The spelling of 18012424 in words is "eighteen million, twelve thousand, four hundred twenty-four".