18021626 has 16 divisors (see below), whose sum is σ = 30995520. Its totient is φ = 7698240.

The previous prime is 18021623. The next prime is 18021629. The reversal of 18021626 is 62612081.

It is an interprime number because it is at equal distance from previous prime (18021623) and next prime (18021629).

It is a junction number, because it is equal to n+sod(n) for n = 18021595 and 18021604.

It is not an unprimeable number, because it can be changed into a prime (18021623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2690 + ... + 6578.

It is an arithmetic number, because the mean of its divisors is an integer number (1937220).

Almost surely, 2^18021626 is an apocalyptic number.

18021626 is a deficient number, since it is larger than the sum of its proper divisors (12973894).

18021626 is a wasteful number, since it uses less digits than its factorization.

18021626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18021626 is about 4245.1885706056. The cubic root of 18021626 is about 262.1790532557.

The spelling of 18021626 in words is "eighteen million, twenty-one thousand, six hundred twenty-six".