28421943 has 32 divisors (see below), whose sum is σ = 45308160. Its totient is φ = 15644160.

The previous prime is 28421927. The next prime is 28421959. The reversal of 28421943 is 34912482.

It is an interprime number because it is at equal distance from previous prime (28421927) and next prime (28421959).

It is not a de Polignac number, because 28421943 - 2⁴ = 28421927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28421983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15396 + ... + 17142.

It is an arithmetic number, because the mean of its divisors is an integer number (1415880).

Almost surely, 2^28421943 is an apocalyptic number.

28421943 is a deficient number, since it is larger than the sum of its proper divisors (16886217).

28421943 is a wasteful number, since it uses less digits than its factorization.

28421943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807.

The product of its digits is 13824, while the sum is 33.

The square root of 28421943 is about 5331.2234055609. The cubic root of 28421943 is about 305.1766172259.

The spelling of 28421943 in words is "twenty-eight million, four hundred twenty-one thousand, nine hundred forty-three".