1649273 has 4 divisors (see below), whose sum is σ = 1655808. Its totient is φ = 1642740.

The previous prime is 1649267. The next prime is 1649287. The reversal of 1649273 is 3729461.

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.

It is a cyclic number.

It is not a de Polignac number, because 1649273 - 2¹⁸ = 1387129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2873 + ... + 3398.

It is an arithmetic number, because the mean of its divisors is an integer number (413952).

2^1649273 is an apocalyptic number.

It is an amenable number.

1649273 is a deficient number, since it is larger than the sum of its proper divisors (6535).

1649273 is an equidigital number, since it uses as much as digits as its factorization.

1649273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6534.

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

The square root of 1649273 is about 1284.2402423223. The cubic root of 1649273 is about 118.1492175275.

The spelling of 1649273 in words is "one million, six hundred forty-nine thousand, two hundred seventy-three".