18196401 has 4 divisors (see below), whose sum is σ = 24261872. Its totient is φ = 12130932.

The previous prime is 18196393. The next prime is 18196403. The reversal of 18196401 is 10469181.

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.

It is not a de Polignac number, because 18196401 - 2³ = 18196393 is a prime.

It is a super-2 number, since 2×18196401² = 662218018705602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18196403) 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, 3032731 + ... + 3032736.

It is an arithmetic number, because the mean of its divisors is an integer number (6065468).

Almost surely, 2^18196401 is an apocalyptic number.

It is an amenable number.

18196401 is a deficient number, since it is larger than the sum of its proper divisors (6065471).

18196401 is an equidigital number, since it uses as much as digits as its factorization.

18196401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6065470.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 18196401 is about 4265.7239713793. The cubic root of 18196401 is about 263.0238717266.

The spelling of 18196401 in words is "eighteen million, one hundred ninety-six thousand, four hundred one".