1630649 has 4 divisors (see below), whose sum is σ = 1641600. Its totient is φ = 1619700.

The previous prime is 1630633. The next prime is 1630663. The reversal of 1630649 is 9460361.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9460361 = 673 ⋅14057.

It is a cyclic number.

It is not a de Polignac number, because 1630649 - 2⁴ = 1630633 is a prime.

It is a super-2 number, since 2×1630649² = 5318032322402, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1630619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5249 + ... + 5550.

It is an arithmetic number, because the mean of its divisors is an integer number (410400).

2^1630649 is an apocalyptic number.

It is an amenable number.

1630649 is a deficient number, since it is larger than the sum of its proper divisors (10951).

1630649 is a wasteful number, since it uses less digits than its factorization.

1630649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10950.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1630649 is about 1276.9686762016. The cubic root of 1630649 is about 117.7028095423.

The spelling of 1630649 in words is "one million, six hundred thirty thousand, six hundred forty-nine".