28418399 has 4 divisors (see below), whose sum is σ = 29079336. Its totient is φ = 27757464.

The previous prime is 28418387. The next prime is 28418419. The reversal of 28418399 is 99381482.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28418399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28418329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330404 + ... + 330489.

It is an arithmetic number, because the mean of its divisors is an integer number (7269834).

Almost surely, 2^28418399 is an apocalyptic number.

28418399 is a deficient number, since it is larger than the sum of its proper divisors (660937).

28418399 is an equidigital number, since it uses as much as digits as its factorization.

28418399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660936.

The product of its digits is 124416, while the sum is 44.

The square root of 28418399 is about 5330.8910137049. The cubic root of 28418399 is about 305.1639322980.

The spelling of 28418399 in words is "twenty-eight million, four hundred eighteen thousand, three hundred ninety-nine".