18140399 has 8 divisors (see below), whose sum is σ = 19582560. Its totient is φ = 16752736.

The previous prime is 18140393. The next prime is 18140401. The reversal of 18140399 is 99304181.

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

It is a cyclic number.

It is not a de Polignac number, because 18140399 - 2¹⁶ = 18074863 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12932 + ... + 14265.

It is an arithmetic number, because the mean of its divisors is an integer number (2447820).

Almost surely, 2^18140399 is an apocalyptic number.

18140399 is a deficient number, since it is larger than the sum of its proper divisors (1442161).

18140399 is a wasteful number, since it uses less digits than its factorization.

18140399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27249.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 18140399 is about 4259.1547283469. The cubic root of 18140399 is about 262.7537633714.

The spelling of 18140399 in words is "eighteen million, one hundred forty thousand, three hundred ninety-nine".