1640016 has 60 divisors (see below), whose sum is σ = 5248672. Its totient is φ = 468288.

The previous prime is 1639999. The next prime is 1640017. The reversal of 1640016 is 6100461.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195 + ... + 1821.

2^1640016 is an apocalyptic number.

1640016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2624336).

1640016 is an abundant number, since it is smaller than the sum of its proper divisors (3608656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640016 is a wasteful number, since it uses less digits than its factorization.

1640016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648 (or 1639 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1640016 is about 1280.6310944218. The cubic root of 1640016 is about 117.9277543018.

Adding to 1640016 its reverse (6100461), we get a palindrome (7740477).

The spelling of 1640016 in words is "one million, six hundred forty thousand, sixteen".