28154239 has 4 divisors (see below), whose sum is σ = 28192480. Its totient is φ = 28116000.

The previous prime is 28154237. The next prime is 28154251. The reversal of 28154239 is 93245182.

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

It is a cyclic number.

It is not a de Polignac number, because 28154239 - 2¹ = 28154237 is a prime.

It is a super-2 number, since 2×28154239² = 1585322347338242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28154237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17994 + ... + 19495.

It is an arithmetic number, because the mean of its divisors is an integer number (7048120).

Almost surely, 2^28154239 is an apocalyptic number.

28154239 is a deficient number, since it is larger than the sum of its proper divisors (38241).

28154239 is an equidigital number, since it uses as much as digits as its factorization.

28154239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38240.

The product of its digits is 17280, while the sum is 34.

The square root of 28154239 is about 5306.0568221609. The cubic root of 28154239 is about 304.2154484676.

The spelling of 28154239 in words is "twenty-eight million, one hundred fifty-four thousand, two hundred thirty-nine".