280142391 has 8 divisors (see below), whose sum is σ = 378640240. Its totient is φ = 184203072.

The previous prime is 280142389. The next prime is 280142393. The reversal of 280142391 is 193241082.

It is an interprime number because it is at equal distance from previous prime (280142389) and next prime (280142393).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 280142391 - 2¹ = 280142389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280142393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639376 + ... + 639813.

It is an arithmetic number, because the mean of its divisors is an integer number (47330030).

Almost surely, 2^280142391 is an apocalyptic number.

280142391 is a deficient number, since it is larger than the sum of its proper divisors (98497849).

280142391 is a wasteful number, since it uses less digits than its factorization.

280142391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279265.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 280142391 is about 16737.4547348156. The cubic root of 280142391 is about 654.3241409594.

The spelling of 280142391 in words is "two hundred eighty million, one hundred forty-two thousand, three hundred ninety-one".