18446738 has 6 divisors (see below), whose sum is σ = 27679221. Its totient is φ = 9220332.

The previous prime is 18446711. The next prime is 18446773. The reversal of 18446738 is 83764481.

It can be written as a sum of positive squares in 2 ways, for example, as 15864289 + 2582449 = 3983^2 + 1607^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3037.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18446695 and 18446704.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4556 + ... + 7592.

Almost surely, 2^18446738 is an apocalyptic number.

18446738 is a deficient number, since it is larger than the sum of its proper divisors (9232483).

18446738 is an frugal number, since it uses more digits than its factorization.

18446738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6076 (or 3039 counting only the distinct ones).

The product of its digits is 129024, while the sum is 41.

The square root of 18446738 is about 4294.9665889271. The cubic root of 18446738 is about 264.2245659637.

The spelling of 18446738 in words is "eighteen million, four hundred forty-six thousand, seven hundred thirty-eight".