18421726 has 8 divisors (see below), whose sum is σ = 27710640. Its totient is φ = 9184848.

The previous prime is 18421723. The next prime is 18421787. The reversal of 18421726 is 62712481.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12111 + ... + 13546.

It is an arithmetic number, because the mean of its divisors is an integer number (3463830).

Almost surely, 2^18421726 is an apocalyptic number.

18421726 is a deficient number, since it is larger than the sum of its proper divisors (9288914).

18421726 is a wasteful number, since it uses less digits than its factorization.

18421726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26018.

The product of its digits is 5376, while the sum is 31.

The square root of 18421726 is about 4292.0538207250. The cubic root of 18421726 is about 264.1050909278.

The spelling of 18421726 in words is "eighteen million, four hundred twenty-one thousand, seven hundred twenty-six".