1649939 has 4 divisors (see below), whose sum is σ = 1652520. Its totient is φ = 1647360.

The previous prime is 1649927. The next prime is 1649959. The reversal of 1649939 is 9399461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9399461 = 197 ⋅47713.

It is a cyclic number.

It is not a de Polignac number, because 1649939 - 2¹² = 1645843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1649896 and 1649905.

It is not an unprimeable number, because it can be changed into a prime (1649959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467 + ... + 1875.

It is an arithmetic number, because the mean of its divisors is an integer number (413130).

2^1649939 is an apocalyptic number.

1649939 is a deficient number, since it is larger than the sum of its proper divisors (2581).

1649939 is a wasteful number, since it uses less digits than its factorization.

1649939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580.

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

The square root of 1649939 is about 1284.4995134293. The cubic root of 1649939 is about 118.1651188346.

The spelling of 1649939 in words is "one million, six hundred forty-nine thousand, nine hundred thirty-nine".