1277864 has 32 divisors (see below), whose sum is σ = 2884800. Its totient is φ = 518400.

The previous prime is 1277863. The next prime is 1277867. The reversal of 1277864 is 4687721.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277863) 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 7 ways as a sum of consecutive naturals, for example, 464 + ... + 1664.

It is an arithmetic number, because the mean of its divisors is an integer number (90150).

2^1277864 is an apocalyptic number.

1277864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1277864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1442400).

1277864 is an abundant number, since it is smaller than the sum of its proper divisors (1606936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1277864 is a wasteful number, since it uses less digits than its factorization.

1277864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1229 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 1277864 is about 1130.4264681968. The cubic root of 1277864 is about 108.5162752455.

The spelling of 1277864 in words is "one million, two hundred seventy-seven thousand, eight hundred sixty-four".