18331648 has 24 divisors (see below), whose sum is σ = 36658440. Its totient is φ = 9164800.

The previous prime is 18331639. The next prime is 18331657. The reversal of 18331648 is 84613381.

It is an interprime number because it is at equal distance from previous prime (18331639) and next prime (18331657).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2428 + ... + 6523.

It is an arithmetic number, because the mean of its divisors is an integer number (1527435).

Almost surely, 2^18331648 is an apocalyptic number.

It is an amenable number.

18331648 is a deficient number, since it is larger than the sum of its proper divisors (18326792).

18331648 is an frugal number, since it uses more digits than its factorization.

18331648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8973 (or 8953 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 18331648 is about 4281.5473838322. The cubic root of 18331648 is about 263.6739163456.

It can be divided in two parts, 1833 and 1648, that added together give a square (3481 = 59²).

The spelling of 18331648 in words is "eighteen million, three hundred thirty-one thousand, six hundred forty-eight".