28400843 has 2 divisors, whose sum is σ = 28400844. Its totient is φ = 28400842.

The previous prime is 28400819. The next prime is 28400861. The reversal of 28400843 is 34800482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28400843 - 2⁸ = 28400587 is a prime.

It is a super-2 number, since 2×28400843² = 1613215766221298, which contains 22 as substring.

It is equal to p_1764812 and since 28400843 and 1764812 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28400893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200421 + 14200422.

It is an arithmetic number, because the mean of its divisors is an integer number (14200422).

Almost surely, 2^28400843 is an apocalyptic number.

28400843 is a deficient number, since it is larger than the sum of its proper divisors (1).

28400843 is an equidigital number, since it uses as much as digits as its factorization.

28400843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 28400843 is about 5329.2441302684. The cubic root of 28400843 is about 305.1010791021.

The spelling of 28400843 in words is "twenty-eight million, four hundred thousand, eight hundred forty-three".