1640916 has 36 divisors (see below), whose sum is σ = 4368000. Its totient is φ = 517968.

The previous prime is 1640887. The next prime is 1640927. The reversal of 1640916 is 6190461.

1640916 is a `hidden beast` number, since 1 + 640 + 9 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1640916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 516 + ... + 1883.

2^1640916 is an apocalyptic number.

It is an amenable number.

1640916 is an abundant number, since it is smaller than the sum of its proper divisors (2727084).

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

1640916 is a wasteful number, since it uses less digits than its factorization.

1640916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428 (or 2423 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1640916 is about 1280.9824354768. The cubic root of 1640916 is about 117.9493222967.

It can be divided in two parts, 1640 and 916, that added together give a triangular number (2556 = T₇₁).

The spelling of 1640916 in words is "one million, six hundred forty thousand, nine hundred sixteen".