1265306397 has 4 divisors (see below), whose sum is σ = 1687075200. Its totient is φ = 843537596.

The previous prime is 1265306377. The next prime is 1265306417. The reversal of 1265306397 is 7936035621.

1265306397 is digitally balanced in base 4, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1265306377) and next prime (1265306417).

It is a cyclic number.

It is not a de Polignac number, because 1265306397 - 2⁷ = 1265306269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265306327) 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, 210884397 + ... + 210884402.

It is an arithmetic number, because the mean of its divisors is an integer number (421768800).

Almost surely, 2^1265306397 is an apocalyptic number.

It is an amenable number.

1265306397 is a deficient number, since it is larger than the sum of its proper divisors (421768803).

1265306397 is an equidigital number, since it uses as much as digits as its factorization.

1265306397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421768802.

The product of its (nonzero) digits is 204120, while the sum is 42.

The square root of 1265306397 is about 35571.1455677210. The cubic root of 1265306397 is about 1081.5964036855.

The spelling of 1265306397 in words is "one billion, two hundred sixty-five million, three hundred six thousand, three hundred ninety-seven".