281399039 has 4 divisors (see below), whose sum is σ = 286012200. Its totient is φ = 276785880.

The previous prime is 281399021. The next prime is 281399051. The reversal of 281399039 is 930993182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 281399039 - 2²⁰ = 280350463 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 (281399539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2306489 + ... + 2306610.

It is an arithmetic number, because the mean of its divisors is an integer number (71503050).

Almost surely, 2^281399039 is an apocalyptic number.

281399039 is a deficient number, since it is larger than the sum of its proper divisors (4613161).

281399039 is an equidigital number, since it uses as much as digits as its factorization.

281399039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4613160.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 281399039 is about 16774.9527272061. The cubic root of 281399039 is about 655.3010592791.

The spelling of 281399039 in words is "two hundred eighty-one million, three hundred ninety-nine thousand, thirty-nine".