18944997 has 8 divisors (see below), whose sum is σ = 25369344. Its totient is φ = 12575328.

The previous prime is 18944977. The next prime is 18945011. The reversal of 18944997 is 79944981.

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

It is not a de Polignac number, because 18944997 - 2¹¹ = 18942949 is a prime.

It is a super-2 number, since 2×18944997² = 717825822660018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18944927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12853 + ... + 14250.

It is an arithmetic number, because the mean of its divisors is an integer number (3171168).

Almost surely, 2^18944997 is an apocalyptic number.

It is an amenable number.

18944997 is a deficient number, since it is larger than the sum of its proper divisors (6424347).

18944997 is a wasteful number, since it uses less digits than its factorization.

18944997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27339.

The product of its digits is 653184, while the sum is 51.

The square root of 18944997 is about 4352.5850939413. The cubic root of 18944997 is about 266.5824246054.

The spelling of 18944997 in words is "eighteen million, nine hundred forty-four thousand, nine hundred ninety-seven".