1640834 has 16 divisors (see below), whose sum is σ = 2671872. Its totient is φ = 751248.

The previous prime is 1640833. The next prime is 1640851. The reversal of 1640834 is 4380461.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1640833) 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 7 ways as a sum of consecutive naturals, for example, 5657 + ... + 5939.

It is an arithmetic number, because the mean of its divisors is an integer number (166992).

2^1640834 is an apocalyptic number.

1640834 is a deficient number, since it is larger than the sum of its proper divisors (1031038).

1640834 is a wasteful number, since it uses less digits than its factorization.

1640834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1640834 is about 1280.9504283929. The cubic root of 1640834 is about 117.9473575393.

The spelling of 1640834 in words is "one million, six hundred forty thousand, eight hundred thirty-four".