1277665423 has 4 divisors (see below), whose sum is σ = 1279423600. Its totient is φ = 1275907248.

The previous prime is 1277665391. The next prime is 1277665427. The reversal of 1277665423 is 3245667721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3245667721 = 1051 ⋅3088171.

It is a cyclic number.

It is not a de Polignac number, because 1277665423 - 2⁵ = 1277665391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1277665423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277665427) 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, 877998 + ... + 879451.

It is an arithmetic number, because the mean of its divisors is an integer number (319855900).

Almost surely, 2^1277665423 is an apocalyptic number.

1277665423 is a deficient number, since it is larger than the sum of its proper divisors (1758177).

1277665423 is an equidigital number, since it uses as much as digits as its factorization.

1277665423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758176.

The product of its digits is 423360, while the sum is 43.

The square root of 1277665423 is about 35744.4460441059. The cubic root of 1277665423 is about 1085.1065389802.

The spelling of 1277665423 in words is "one billion, two hundred seventy-seven million, six hundred sixty-five thousand, four hundred twenty-three".