1649797 has 2 divisors, whose sum is σ = 1649798. Its totient is φ = 1649796.

The previous prime is 1649783. The next prime is 1649801. The reversal of 1649797 is 7979461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1640961 + 8836 = 1281^2 + 94^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649797 - 2¹⁵ = 1617029 is a prime.

It is an Ulam number.

1649797 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824898 + 824899.

It is an arithmetic number, because the mean of its divisors is an integer number (824899).

2^1649797 is an apocalyptic number.

It is an amenable number.

1649797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649797 is an equidigital number, since it uses as much as digits as its factorization.

1649797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 1649797 is about 1284.4442377931. Note that the first 3 decimals coincide. The cubic root of 1649797 is about 118.1617288248.

The spelling of 1649797 in words is "one million, six hundred forty-nine thousand, seven hundred ninety-seven".