1640056 has 16 divisors (see below), whose sum is σ = 3354840. Its totient is φ = 745440.

The previous prime is 1640053. The next prime is 1640057. The reversal of 1640056 is 6500461.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640053) 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, 9231 + ... + 9406.

2^1640056 is an apocalyptic number.

It is an amenable number.

1640056 is an abundant number, since it is smaller than the sum of its proper divisors (1714784).

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

1640056 is a wasteful number, since it uses less digits than its factorization.

1640056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18654 (or 18650 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1640056 is about 1280.6467116266. The cubic root of 1640056 is about 117.9287130469.

The spelling of 1640056 in words is "one million, six hundred forty thousand, fifty-six".