1277920 has 72 divisors (see below), whose sum is σ = 3533544. Its totient is φ = 435456.

The previous prime is 1277911. The next prime is 1277957. The reversal of 1277920 is 297721.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7759 + ... + 7921.

It is an arithmetic number, because the mean of its divisors is an integer number (49077).

2^1277920 is an apocalyptic number.

1277920 is a gapful number since it is divisible by the number (10) 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 1277920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1766772).

1277920 is an abundant number, since it is smaller than the sum of its proper divisors (2255624).

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

1277920 is a wasteful number, since it uses less digits than its factorization.

1277920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 1277920 is about 1130.4512373384. The cubic root of 1277920 is about 108.5178603966.

It can be divided in two parts, 1277 and 920, that added together give a cube (2197 = 13³).

The spelling of 1277920 in words is "one million, two hundred seventy-seven thousand, nine hundred twenty".