264139989 has 4 divisors (see below), whose sum is σ = 352186656. Its totient is φ = 176093324.

The previous prime is 264139987. The next prime is 264140029. The reversal of 264139989 is 989931462.

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 264139989 - 2¹ = 264139987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264139987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44023329 + ... + 44023334.

It is an arithmetic number, because the mean of its divisors is an integer number (88046664).

Almost surely, 2^264139989 is an apocalyptic number.

It is an amenable number.

264139989 is a deficient number, since it is larger than the sum of its proper divisors (88046667).

264139989 is an equidigital number, since it uses as much as digits as its factorization.

264139989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88046666.

The product of its digits is 839808, while the sum is 51.

The square root of 264139989 is about 16252.3841020325. The cubic root of 264139989 is about 641.6202347317.

The spelling of 264139989 in words is "two hundred sixty-four million, one hundred thirty-nine thousand, nine hundred eighty-nine".