1266397 has 4 divisors (see below), whose sum is σ = 1381536. Its totient is φ = 1151260.

The previous prime is 1266389. The next prime is 1266409. The reversal of 1266397 is 7936621.

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 not a de Polignac number, because 1266397 - 2³ = 1266389 is a prime.

It is a super-2 number, since 2×1266397² = 3207522723218, 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 (1266337) 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, 57553 + ... + 57574.

It is an arithmetic number, because the mean of its divisors is an integer number (345384).

2^1266397 is an apocalyptic number.

It is an amenable number.

1266397 is a deficient number, since it is larger than the sum of its proper divisors (115139).

1266397 is a wasteful number, since it uses less digits than its factorization.

1266397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115138.

The product of its digits is 13608, while the sum is 34.

The square root of 1266397 is about 1125.3430588047. The cubic root of 1266397 is about 108.1907067184.

The spelling of 1266397 in words is "one million, two hundred sixty-six thousand, three hundred ninety-seven".