18122072 has 16 divisors (see below), whose sum is σ = 34702560. Its totient is φ = 8868064.

The previous prime is 18122059. The next prime is 18122077. The reversal of 18122072 is 27022181.

It is a super-3 number, since 3×18122072³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23723 + ... + 24474.

It is an arithmetic number, because the mean of its divisors is an integer number (2168910).

Almost surely, 2^18122072 is an apocalyptic number.

It is an amenable number.

18122072 is a deficient number, since it is larger than the sum of its proper divisors (16580488).

18122072 is a wasteful number, since it uses less digits than its factorization.

18122072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48250 (or 48246 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 18122072 is about 4257.0027014321. The cubic root of 18122072 is about 262.6652480305.

Subtracting from 18122072 its sum of digits (23), we obtain a square (18122049 = 4257²).

The spelling of 18122072 in words is "eighteen million, one hundred twenty-two thousand, seventy-two".