18143397 has 6 divisors (see below), whose sum is σ = 26207142. Its totient is φ = 12095592.

The previous prime is 18143387. The next prime is 18143453. The reversal of 18143397 is 79334181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17715681 + 427716 = 4209^2 + 654^2 .

It is not a de Polignac number, because 18143397 - 2¹¹ = 18141349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18143387) 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 5 ways as a sum of consecutive naturals, for example, 1007958 + ... + 1007975.

It is an arithmetic number, because the mean of its divisors is an integer number (4367857).

Almost surely, 2^18143397 is an apocalyptic number.

It is an amenable number.

18143397 is a deficient number, since it is larger than the sum of its proper divisors (8063745).

18143397 is a wasteful number, since it uses less digits than its factorization.

18143397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015939 (or 2015936 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 18143397 is about 4259.5066615748. The cubic root of 18143397 is about 262.7682373711.

The spelling of 18143397 in words is "eighteen million, one hundred forty-three thousand, three hundred ninety-seven".