1277921 has 8 divisors (see below), whose sum is σ = 1360320. Its totient is φ = 1197072.

The previous prime is 1277911. The next prime is 1277957. The reversal of 1277921 is 1297721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1277921 - 2¹⁰ = 1276897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1277911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1631 + ... + 2283.

It is an arithmetic number, because the mean of its divisors is an integer number (170040).

2^1277921 is an apocalyptic number.

1277921 is the 653-rd octagonal number.

It is an amenable number.

1277921 is a deficient number, since it is larger than the sum of its proper divisors (82399).

1277921 is a wasteful number, since it uses less digits than its factorization.

1277921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775.

The product of its digits is 1764, while the sum is 29.

The square root of 1277921 is about 1130.4516796396. The cubic root of 1277921 is about 108.5178887025.

The spelling of 1277921 in words is "one million, two hundred seventy-seven thousand, nine hundred twenty-one".