1640716 has 36 divisors (see below), whose sum is σ = 3648456. Its totient is φ = 638400.

The previous prime is 1640701. The next prime is 1640729. The reversal of 1640716 is 6170461.

It is a happy number.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 1776 + ... + 2536.

It is an arithmetic number, because the mean of its divisors is an integer number (101346).

2^1640716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1824228).

1640716 is an abundant number, since it is smaller than the sum of its proper divisors (2007740).

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

1640716 is a wasteful number, since it uses less digits than its factorization.

1640716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 1640716 is about 1280.9043680150. The cubic root of 1640716 is about 117.9445300906.

The spelling of 1640716 in words is "one million, six hundred forty thousand, seven hundred sixteen".