264399137 has 4 divisors (see below), whose sum is σ = 264484740. Its totient is φ = 264313536.

The previous prime is 264399127. The next prime is 264399197. The reversal of 264399137 is 731993462.

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

It can be written as a sum of positive squares in 2 ways, for example, as 197093521 + 67305616 = 14039^2 + 8204^2 .

It is a cyclic number.

It is not a de Polignac number, because 264399137 - 2¹⁴ = 264382753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264399127) 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, 37988 + ... + 44405.

It is an arithmetic number, because the mean of its divisors is an integer number (66121185).

Almost surely, 2^264399137 is an apocalyptic number.

It is an amenable number.

264399137 is a deficient number, since it is larger than the sum of its proper divisors (85603).

264399137 is an equidigital number, since it uses as much as digits as its factorization.

264399137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85602.

The product of its digits is 244944, while the sum is 44.

The square root of 264399137 is about 16260.3547624275. The cubic root of 264399137 is about 641.8299975592.

The spelling of 264399137 in words is "two hundred sixty-four million, three hundred ninety-nine thousand, one hundred thirty-seven".