1649245 has 8 divisors (see below), whose sum is σ = 2131416. Its totient is φ = 1217856.

The previous prime is 1649243. The next prime is 1649251. The reversal of 1649245 is 5429461.

It can be written as a sum of positive squares in 4 ways, for example, as 76729 + 1572516 = 277^2 + 1254^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1649245 - 2¹ = 1649243 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649243) 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 7 ways as a sum of consecutive naturals, for example, 12622 + ... + 12751.

It is an arithmetic number, because the mean of its divisors is an integer number (266427).

2^1649245 is an apocalyptic number.

It is an amenable number.

1649245 is a deficient number, since it is larger than the sum of its proper divisors (482171).

1649245 is a wasteful number, since it uses less digits than its factorization.

1649245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25391.

The product of its digits is 8640, while the sum is 31.

The square root of 1649245 is about 1284.2293408889. The cubic root of 1649245 is about 118.1485489103.

It can be divided in two parts, 164 and 9245, that added together give a square (9409 = 97²).

The spelling of 1649245 in words is "one million, six hundred forty-nine thousand, two hundred forty-five".