1640956 has 6 divisors (see below), whose sum is σ = 2871680. Its totient is φ = 820476.

The previous prime is 1640953. The next prime is 1640971. The reversal of 1640956 is 6590461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205116 + ... + 205123.

2^1640956 is an apocalyptic number.

It is an amenable number.

1640956 is a deficient number, since it is larger than the sum of its proper divisors (1230724).

1640956 is a wasteful number, since it uses less digits than its factorization.

1640956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410243 (or 410241 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1640956 is about 1280.9980483982. The cubic root of 1640956 is about 117.9502806912.

The spelling of 1640956 in words is "one million, six hundred forty thousand, nine hundred fifty-six".