18422501 has 8 divisors (see below), whose sum is σ = 18727200. Its totient is φ = 18120400.

The previous prime is 18422497. The next prime is 18422507. The reversal of 18422501 is 10522481.

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

It is a cyclic number.

It is not a de Polignac number, because 18422501 - 2² = 18422497 is a prime.

It is a super-4 number, since 4×18422501⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18422507) 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, 17570 + ... + 18588.

It is an arithmetic number, because the mean of its divisors is an integer number (2340900).

Almost surely, 2^18422501 is an apocalyptic number.

It is an amenable number.

18422501 is a deficient number, since it is larger than the sum of its proper divisors (304699).

18422501 is a wasteful number, since it uses less digits than its factorization.

18422501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1299.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 18422501 is about 4292.1441028931. The cubic root of 18422501 is about 264.1087945000.

Adding to 18422501 its reverse (10522481), we get a palindrome (28944982).

The spelling of 18422501 in words is "eighteen million, four hundred twenty-two thousand, five hundred one".