280142385 has 16 divisors (see below), whose sum is σ = 448471296. Its totient is φ = 149328128.

The previous prime is 280142383. The next prime is 280142389. The reversal of 280142385 is 583241082.

It is a cyclic number.

It is not a de Polignac number, because 280142385 - 2¹ = 280142383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280142383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32392 + ... + 40118.

It is an arithmetic number, because the mean of its divisors is an integer number (28029456).

Almost surely, 2^280142385 is an apocalyptic number.

It is an amenable number.

280142385 is a deficient number, since it is larger than the sum of its proper divisors (168328911).

280142385 is a wasteful number, since it uses less digits than its factorization.

280142385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10152.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 280142385 is about 16737.4545555768. The cubic root of 280142385 is about 654.3241362880.

The spelling of 280142385 in words is "two hundred eighty million, one hundred forty-two thousand, three hundred eighty-five".