280421879 has 2 divisors, whose sum is σ = 280421880. Its totient is φ = 280421878.

The previous prime is 280421873. The next prime is 280421899. The reversal of 280421879 is 978124082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280421879 - 2⁴ = 280421863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280421873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140210939 + 140210940.

It is an arithmetic number, because the mean of its divisors is an integer number (140210940).

Almost surely, 2^280421879 is an apocalyptic number.

280421879 is a deficient number, since it is larger than the sum of its proper divisors (1).

280421879 is an equidigital number, since it uses as much as digits as its factorization.

280421879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 280421879 is about 16745.8018321011. The cubic root of 280421879 is about 654.5416671995.

The spelling of 280421879 in words is "two hundred eighty million, four hundred twenty-one thousand, eight hundred seventy-nine".