18133390 has 32 divisors (see below), whose sum is σ = 37705824. Its totient is φ = 6205440.

The previous prime is 18133387. The next prime is 18133393. The reversal of 18133390 is 9333181.

It is an interprime number because it is at equal distance from previous prime (18133387) and next prime (18133393).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18133393) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 2979 + ... + 6718.

It is an arithmetic number, because the mean of its divisors is an integer number (1178307).

Almost surely, 2^18133390 is an apocalyptic number.

18133390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18133390 is an abundant number, since it is smaller than the sum of its proper divisors (19572434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18133390 is a wasteful number, since it uses less digits than its factorization.

18133390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9732.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 18133390 is about 4258.3318330069. The cubic root of 18133390 is about 262.7199185009.

The spelling of 18133390 in words is "eighteen million, one hundred thirty-three thousand, three hundred ninety".