18197450 has 12 divisors (see below), whose sum is σ = 33847350. Its totient is φ = 7278960.

The previous prime is 18197447. The next prime is 18197453. The reversal of 18197450 is 5479181.

It is an interprime number because it is at equal distance from previous prime (18197447) and next prime (18197453).

It can be written as a sum of positive squares in 3 ways, for example, as 6901129 + 11296321 = 2627^2 + 3361^2 .

It is a super-2 number, since 2×18197450² = 662294373005000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18197450.

It is not an unprimeable number, because it can be changed into a prime (18197453) 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 5 ways as a sum of consecutive naturals, for example, 181925 + ... + 182024.

Almost surely, 2^18197450 is an apocalyptic number.

18197450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18197450 is a deficient number, since it is larger than the sum of its proper divisors (15649900).

18197450 is a wasteful number, since it uses less digits than its factorization.

18197450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363961 (or 363956 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 18197450 is about 4265.8469264614. The cubic root of 18197450 is about 263.0289259630.

The spelling of 18197450 in words is "eighteen million, one hundred ninety-seven thousand, four hundred fifty".