1280149 has 4 divisors (see below), whose sum is σ = 1378636. Its totient is φ = 1181664.

The previous prime is 1280141. The next prime is 1280159. The reversal of 1280149 is 9410821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9410821 = 7 ⋅1344403.

It can be written as a sum of positive squares in 2 ways, for example, as 145924 + 1134225 = 382^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280149 - 2³ = 1280141 is a prime.

It is a Duffinian number.

1280149 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280141) 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, 49224 + ... + 49249.

It is an arithmetic number, because the mean of its divisors is an integer number (344659).

2^1280149 is an apocalyptic number.

It is an amenable number.

1280149 is a deficient number, since it is larger than the sum of its proper divisors (98487).

1280149 is an equidigital number, since it uses as much as digits as its factorization.

1280149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98486.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1280149 is about 1131.4366973013. The cubic root of 1280149 is about 108.5809175027.

The spelling of 1280149 in words is "one million, two hundred eighty thousand, one hundred forty-nine".