18197001 has 16 divisors (see below), whose sum is σ = 27086400. Its totient is φ = 12073824.

The previous prime is 18196993. The next prime is 18197009. The reversal of 18197001 is 10079181.

It is an interprime number because it is at equal distance from previous prime (18196993) and next prime (18197009).

It is not a de Polignac number, because 18197001 - 2³ = 18196993 is a prime.

It is a super-2 number, since 2×18197001² = 662261690788002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18197009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4645 + ... + 7613.

It is an arithmetic number, because the mean of its divisors is an integer number (1692900).

Almost surely, 2^18197001 is an apocalyptic number.

It is an amenable number.

18197001 is a deficient number, since it is larger than the sum of its proper divisors (8889399).

18197001 is a wasteful number, since it uses less digits than its factorization.

18197001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3205 (or 3199 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 18197001 is about 4265.7942988381. The cubic root of 18197001 is about 263.0267626387.

The spelling of 18197001 in words is "eighteen million, one hundred ninety-seven thousand, one".