18051402 has 8 divisors (see below), whose sum is σ = 36102816. Its totient is φ = 6017132.

The previous prime is 18051379. The next prime is 18051403. The reversal of 18051402 is 20415081.

It is a sphenic number, since it is the product of 3 distinct primes.

18051402 is an admirable number.

It is a super-2 number, since 2×18051402² = 651706228331208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18051403) 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 3 ways as a sum of consecutive naturals, for example, 1504278 + ... + 1504289.

It is an arithmetic number, because the mean of its divisors is an integer number (4512852).

Almost surely, 2^18051402 is an apocalyptic number.

18051402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18051402 is a wasteful number, since it uses less digits than its factorization.

18051402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3008572.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 18051402 is about 4248.6941523249. The cubic root of 18051402 is about 262.3233677949.

Adding to 18051402 its reverse (20415081), we get a palindrome (38466483).

The spelling of 18051402 in words is "eighteen million, fifty-one thousand, four hundred two".