280396387 has 2 divisors, whose sum is σ = 280396388. Its totient is φ = 280396386.

The previous prime is 280396309. The next prime is 280396429. The reversal of 280396387 is 783693082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280396387 - 2²³ = 272007779 is a prime.

It is not a weakly prime, because it can be changed into another prime (280396307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140198193 + 140198194.

It is an arithmetic number, because the mean of its divisors is an integer number (140198194).

Almost surely, 2^280396387 is an apocalyptic number.

280396387 is a deficient number, since it is larger than the sum of its proper divisors (1).

280396387 is an equidigital number, since it uses as much as digits as its factorization.

280396387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 280396387 is about 16745.0406688070. The cubic root of 280396387 is about 654.5218327012.

The spelling of 280396387 in words is "two hundred eighty million, three hundred ninety-six thousand, three hundred eighty-seven".