28421397 has 12 divisors (see below), whose sum is σ = 43214080. Its totient is φ = 17950248.

The previous prime is 28421383. The next prime is 28421411. The reversal of 28421397 is 79312482.

It is an interprime number because it is at equal distance from previous prime (28421383) and next prime (28421411).

It is not a de Polignac number, because 28421397 - 2¹⁵ = 28388629 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 (28421317) 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 11 ways as a sum of consecutive naturals, for example, 82933 + ... + 83274.

Almost surely, 2^28421397 is an apocalyptic number.

It is an amenable number.

28421397 is a deficient number, since it is larger than the sum of its proper divisors (14792683).

28421397 is a wasteful number, since it uses less digits than its factorization.

28421397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166232 (or 166229 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 28421397 is about 5331.1721975566. The cubic root of 28421397 is about 305.1746630139.

The spelling of 28421397 in words is "twenty-eight million, four hundred twenty-one thousand, three hundred ninety-seven".