1277221 has 8 divisors (see below), whose sum is σ = 1414944. Its totient is φ = 1143120.

The previous prime is 1277209. The next prime is 1277233. The reversal of 1277221 is 1227721.

It is an interprime number because it is at equal distance from previous prime (1277209) and next prime (1277233).

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

It is not a de Polignac number, because 1277221 - 2⁷ = 1277093 is a prime.

It is a Duffinian number.

1277221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1277192 and 1277201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277021) 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, 130 + ... + 1603.

It is an arithmetic number, because the mean of its divisors is an integer number (176868).

2^1277221 is an apocalyptic number.

1277221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1277221 is a deficient number, since it is larger than the sum of its proper divisors (137723).

1277221 is a wasteful number, since it uses less digits than its factorization.

1277221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811.

The product of its digits is 392, while the sum is 22.

The square root of 1277221 is about 1130.1420264728. The cubic root of 1277221 is about 108.4980709943.

The spelling of 1277221 in words is "one million, two hundred seventy-seven thousand, two hundred twenty-one".