2019649 has 8 divisors (see below), whose sum is σ = 2077992. Its totient is φ = 1962240.

The previous prime is 2019623. The next prime is 2019659. The reversal of 2019649 is 9469102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3249 + 2016400 = 57^2 + 1420^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2019649 - 2⁹ = 2019137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2019649.

It is not an unprimeable number, because it can be changed into a prime (2019659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6747 + ... + 7039.

It is an arithmetic number, because the mean of its divisors is an integer number (259749).

2^2019649 is an apocalyptic number.

It is an amenable number.

2019649 is a deficient number, since it is larger than the sum of its proper divisors (58343).

2019649 is a wasteful number, since it uses less digits than its factorization.

2019649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 2019649 is about 1421.1435536215. The cubic root of 2019649 is about 126.4033642551.

The spelling of 2019649 in words is "two million, nineteen thousand, six hundred forty-nine".