1648667 has 4 divisors (see below), whose sum is σ = 1651680. Its totient is φ = 1645656.

The previous prime is 1648613. The next prime is 1648697. The reversal of 1648667 is 7668461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7668461 = 751 ⋅10211.

It is a cyclic number.

It is not a de Polignac number, because 1648667 - 2¹² = 1644571 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 1648667.

It is not an unprimeable number, because it can be changed into a prime (1648697) 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, 428 + ... + 1865.

It is an arithmetic number, because the mean of its divisors is an integer number (412920).

2^1648667 is an apocalyptic number.

1648667 is a deficient number, since it is larger than the sum of its proper divisors (3013).

1648667 is an equidigital number, since it uses as much as digits as its factorization.

1648667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012.

The product of its digits is 48384, while the sum is 38.

The square root of 1648667 is about 1284.0042834820. The cubic root of 1648667 is about 118.1347450505.

The spelling of 1648667 in words is "one million, six hundred forty-eight thousand, six hundred sixty-seven".