1273649 has 4 divisors (see below), whose sum is σ = 1371636. Its totient is φ = 1175664.

The previous prime is 1273639. The next prime is 1273663. The reversal of 1273649 is 9463721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 874225 + 399424 = 935^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273649 - 2¹⁶ = 1208113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1273609) 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, 48974 + ... + 48999.

It is an arithmetic number, because the mean of its divisors is an integer number (342909).

2^1273649 is an apocalyptic number.

It is an amenable number.

1273649 is a deficient number, since it is larger than the sum of its proper divisors (97987).

1273649 is an equidigital number, since it uses as much as digits as its factorization.

1273649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97986.

The product of its digits is 9072, while the sum is 32.

The square root of 1273649 is about 1128.5605876514. The cubic root of 1273649 is about 108.3968311506.

The spelling of 1273649 in words is "one million, two hundred seventy-three thousand, six hundred forty-nine".