1280436 has 12 divisors (see below), whose sum is σ = 2987712. Its totient is φ = 426808.

The previous prime is 1280431. The next prime is 1280453. The reversal of 1280436 is 6340821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280431) 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, 53340 + ... + 53363.

It is an arithmetic number, because the mean of its divisors is an integer number (248976).

2^1280436 is an apocalyptic number.

It is an amenable number.

1280436 is an abundant number, since it is smaller than the sum of its proper divisors (1707276).

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

1280436 is a wasteful number, since it uses less digits than its factorization.

1280436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106710 (or 106708 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1280436 is about 1131.5635200907. The cubic root of 1280436 is about 108.5890312443.

The spelling of 1280436 in words is "one million, two hundred eighty thousand, four hundred thirty-six".