1649649 has 4 divisors (see below), whose sum is σ = 2199536. Its totient is φ = 1099764.

The previous prime is 1649647. The next prime is 1649651. The reversal of 1649649 is 9469461.

1649649 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1649647) and next prime (1649651).

It is not a de Polignac number, because 1649649 - 2¹ = 1649647 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649647) 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, 274939 + ... + 274944.

It is an arithmetic number, because the mean of its divisors is an integer number (549884).

2^1649649 is an apocalyptic number.

It is an amenable number.

1649649 is a deficient number, since it is larger than the sum of its proper divisors (549887).

1649649 is an equidigital number, since it uses as much as digits as its factorization.

1649649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549886.

The product of its digits is 46656, while the sum is 39.

The square root of 1649649 is about 1284.3866240350. The cubic root of 1649649 is about 118.1581953681.

The spelling of 1649649 in words is "one million, six hundred forty-nine thousand, six hundred forty-nine".