18698644 has 6 divisors (see below), whose sum is σ = 32722634. Its totient is φ = 9349320.

The previous prime is 18698629. The next prime is 18698663. The reversal of 18698644 is 44689681.

It can be written as a sum of positive squares in only one way, i.e., 13690000 + 5008644 = 3700^2 + 2238^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18698594 and 18698603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2337327 + ... + 2337334.

Almost surely, 2^18698644 is an apocalyptic number.

It is an amenable number.

18698644 is a deficient number, since it is larger than the sum of its proper divisors (14023990).

18698644 is a wasteful number, since it uses less digits than its factorization.

18698644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674665 (or 4674663 counting only the distinct ones).

The product of its digits is 331776, while the sum is 46.

The square root of 18698644 is about 4324.1928726642. The cubic root of 18698644 is about 265.4218698727.

The spelling of 18698644 in words is "eighteen million, six hundred ninety-eight thousand, six hundred forty-four".