18401723 has 4 divisors (see below), whose sum is σ = 18454800. Its totient is φ = 18348648.

The previous prime is 18401717. The next prime is 18401731. The reversal of 18401723 is 32710481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32710481 = 71 ⋅460711.

It is a cyclic number.

It is not a de Polignac number, because 18401723 - 2¹² = 18397627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18401692 and 18401701.

It is not an unprimeable number, because it can be changed into a prime (18401783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26015 + ... + 26712.

It is an arithmetic number, because the mean of its divisors is an integer number (4613700).

Almost surely, 2^18401723 is an apocalyptic number.

18401723 is a deficient number, since it is larger than the sum of its proper divisors (53077).

18401723 is an equidigital number, since it uses as much as digits as its factorization.

18401723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53076.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 18401723 is about 4289.7229514270. The cubic root of 18401723 is about 264.0094645750.

The spelling of 18401723 in words is "eighteen million, four hundred one thousand, seven hundred twenty-three".