280381987 has 2 divisors, whose sum is σ = 280381988. Its totient is φ = 280381986.

The previous prime is 280381963. The next prime is 280381999. The reversal of 280381987 is 789183082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 280381987 - 2⁷ = 280381859 is a prime.

It is a super-2 number, since 2×280381987² = 157228117268136338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (280381687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140190993 + 140190994.

It is an arithmetic number, because the mean of its divisors is an integer number (140190994).

Almost surely, 2^280381987 is an apocalyptic number.

280381987 is a deficient number, since it is larger than the sum of its proper divisors (1).

280381987 is an equidigital number, since it uses as much as digits as its factorization.

280381987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 280381987 is about 16744.6106852324. The cubic root of 280381987 is about 654.5106279970.

The spelling of 280381987 in words is "two hundred eighty million, three hundred eighty-one thousand, nine hundred eighty-seven".