1649993 has 2 divisors, whose sum is σ = 1649994. Its totient is φ = 1649992.

The previous prime is 1649987. The next prime is 1650001. The reversal of 1649993 is 3999461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1236544 + 413449 = 1112^2 + 643^2 .

It is an emirp because it is prime and its reverse (3999461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1649993 - 2⁸ = 1649737 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1649993.

It is not a weakly prime, because it can be changed into another prime (1649393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824996 + 824997.

It is an arithmetic number, because the mean of its divisors is an integer number (824997).

2^1649993 is an apocalyptic number.

It is an amenable number.

1649993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649993 is an equidigital number, since it uses as much as digits as its factorization.

1649993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 41.

The square root of 1649993 is about 1284.5205331173. The cubic root of 1649993 is about 118.1664079423.

The spelling of 1649993 in words is "one million, six hundred forty-nine thousand, nine hundred ninety-three".