1648139 has 4 divisors (see below), whose sum is σ = 1656960. Its totient is φ = 1639320.

The previous prime is 1648081. The next prime is 1648181. The reversal of 1648139 is 9318461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1648139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1648039) 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, 4124 + ... + 4505.

It is an arithmetic number, because the mean of its divisors is an integer number (414240).

2^1648139 is an apocalyptic number.

1648139 is a deficient number, since it is larger than the sum of its proper divisors (8821).

1648139 is an equidigital number, since it uses as much as digits as its factorization.

1648139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8820.

The product of its digits is 5184, while the sum is 32.

The square root of 1648139 is about 1283.7986602268. The cubic root of 1648139 is about 118.1221324761.

The spelling of 1648139 in words is "one million, six hundred forty-eight thousand, one hundred thirty-nine".