1649798 has 4 divisors (see below), whose sum is σ = 2474700. Its totient is φ = 824898.

The previous prime is 1649797. The next prime is 1649801. The reversal of 1649798 is 8979461.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412448 + ... + 412451.

It is an arithmetic number, because the mean of its divisors is an integer number (618675).

2^1649798 is an apocalyptic number.

1649798 is a deficient number, since it is larger than the sum of its proper divisors (824902).

1649798 is an equidigital number, since it uses as much as digits as its factorization.

1649798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824901.

The product of its digits is 108864, while the sum is 44.

The square root of 1649798 is about 1284.4446270665. Note that the first 3 decimals coincide. The cubic root of 1649798 is about 118.1617526988.

The spelling of 1649798 in words is "one million, six hundred forty-nine thousand, seven hundred ninety-eight".