18722801 has 4 divisors (see below), whose sum is σ = 18736704. Its totient is φ = 18708900.

The previous prime is 18722783. The next prime is 18722813. The reversal of 18722801 is 10822781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10822781 = 1217 ⋅8893.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18722801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18722861) 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, 4685 + ... + 7706.

It is an arithmetic number, because the mean of its divisors is an integer number (4684176).

Almost surely, 2^18722801 is an apocalyptic number.

It is an amenable number.

18722801 is a deficient number, since it is larger than the sum of its proper divisors (13903).

18722801 is a wasteful number, since it uses less digits than its factorization.

18722801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13902.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 18722801 is about 4326.9852091266. The cubic root of 18722801 is about 265.5361212400.

The spelling of 18722801 in words is "eighteen million, seven hundred twenty-two thousand, eight hundred one".