1799649 has 6 divisors (see below), whose sum is σ = 2599506. Its totient is φ = 1199760.

The previous prime is 1799639. The next prime is 1799701. The reversal of 1799649 is 9469971.

It can be written as a sum of positive squares in only one way, i.e., 1782225 + 17424 = 1335^2 + 132^2 .

It is not a de Polignac number, because 1799649 - 2⁵ = 1799617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1799639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99972 + ... + 99989.

It is an arithmetic number, because the mean of its divisors is an integer number (433251).

2^1799649 is an apocalyptic number.

It is an amenable number.

1799649 is a deficient number, since it is larger than the sum of its proper divisors (799857).

1799649 is a wasteful number, since it uses less digits than its factorization.

1799649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199967 (or 199964 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 1799649 is about 1341.5099701456. The cubic root of 1799649 is about 121.6361325349.

The spelling of 1799649 in words is "one million, seven hundred ninety-nine thousand, six hundred forty-nine".