1283649 has 4 divisors (see below), whose sum is σ = 1711536. Its totient is φ = 855764.

The previous prime is 1283603. The next prime is 1283677. The reversal of 1283649 is 9463821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9463821 = 3 ⋅3154607.

It is a cyclic number.

It is not a de Polignac number, because 1283649 - 2⁷ = 1283521 is a prime.

It is an Ulam number.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1283549) 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, 213939 + ... + 213944.

It is an arithmetic number, because the mean of its divisors is an integer number (427884).

2^1283649 is an apocalyptic number.

It is an amenable number.

1283649 is a deficient number, since it is larger than the sum of its proper divisors (427887).

1283649 is an equidigital number, since it uses as much as digits as its factorization.

1283649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427886.

The product of its digits is 10368, while the sum is 33.

The square root of 1283649 is about 1132.9823476118. The cubic root of 1283649 is about 108.6797829192.

The spelling of 1283649 in words is "one million, two hundred eighty-three thousand, six hundred forty-nine".