265406993 has 4 divisors (see below), whose sum is σ = 265453620. Its totient is φ = 265360368.

The previous prime is 265406971. The next prime is 265407007. The reversal of 265406993 is 399604562.

265406993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 18037009 + 247369984 = 4247^2 + 15728^2 .

It is a cyclic number.

It is not a de Polignac number, because 265406993 - 2⁶ = 265406929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (265406923) 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, 13358 + ... + 26631.

It is an arithmetic number, because the mean of its divisors is an integer number (66363405).

Almost surely, 2^265406993 is an apocalyptic number.

It is an amenable number.

265406993 is a deficient number, since it is larger than the sum of its proper divisors (46627).

265406993 is an equidigital number, since it uses as much as digits as its factorization.

265406993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46626.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 265406993 is about 16291.3164906953. The cubic root of 265406993 is about 642.6444883904.

It can be divided in two parts, 26540 and 6993, that added together give a palindrome (33533).

The spelling of 265406993 in words is "two hundred sixty-five million, four hundred six thousand, nine hundred ninety-three".