18121607 has 8 divisors (see below), whose sum is σ = 21424800. Its totient is φ = 14997024.

The previous prime is 18121603. The next prime is 18121613. The reversal of 18121607 is 70612181.

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

It is not a de Polignac number, because 18121607 - 2² = 18121603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18121603) 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, 44432 + ... + 44837.

It is an arithmetic number, because the mean of its divisors is an integer number (2678100).

Almost surely, 2^18121607 is an apocalyptic number.

18121607 is a deficient number, since it is larger than the sum of its proper divisors (3303193).

18121607 is an equidigital number, since it uses as much as digits as its factorization.

18121607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89305.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 18121607 is about 4256.9480851897. The cubic root of 18121607 is about 262.6630014076.

Adding to 18121607 its reverse (70612181), we get a palindrome (88733788).

The spelling of 18121607 in words is "eighteen million, one hundred twenty-one thousand, six hundred seven".