18726401 has 8 divisors (see below), whose sum is σ = 20052360. Its totient is φ = 17425408.

The previous prime is 18726361. The next prime is 18726413. The reversal of 18726401 is 10462781.

It can be written as a sum of positive squares in 4 ways, for example, as 442225 + 18284176 = 665^2 + 4276^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-18726401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18726481) 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, 4676 + ... + 7701.

It is an arithmetic number, because the mean of its divisors is an integer number (2506545).

Almost surely, 2^18726401 is an apocalyptic number.

It is an amenable number.

18726401 is a deficient number, since it is larger than the sum of its proper divisors (1325959).

18726401 is a wasteful number, since it uses less digits than its factorization.

18726401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12483.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 18726401 is about 4327.4011831583. The cubic root of 18726401 is about 265.5531391491.

The spelling of 18726401 in words is "eighteen million, seven hundred twenty-six thousand, four hundred one".