239278981 has 4 divisors (see below), whose sum is σ = 239343552. Its totient is φ = 239214412.

The previous prime is 239278973. The next prime is 239279009. The reversal of 239278981 is 189872932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 239278981 - 2³ = 239278973 is a prime.

It is a super-2 number, since 2×239278981² = 114508861496796722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239278901) 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 3 ways as a sum of consecutive naturals, for example, 26365 + ... + 34258.

It is an arithmetic number, because the mean of its divisors is an integer number (59835888).

Almost surely, 2^239278981 is an apocalyptic number.

It is an amenable number.

239278981 is a deficient number, since it is larger than the sum of its proper divisors (64571).

239278981 is an equidigital number, since it uses as much as digits as its factorization.

239278981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64570.

The product of its digits is 435456, while the sum is 49.

The square root of 239278981 is about 15468.6450925736. The cubic root of 239278981 is about 620.8235509211.

The spelling of 239278981 in words is "two hundred thirty-nine million, two hundred seventy-eight thousand, nine hundred eighty-one".