1640953 has 2 divisors, whose sum is σ = 1640954. Its totient is φ = 1640952.

The previous prime is 1640941. The next prime is 1640971. The reversal of 1640953 is 3590461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1505529 + 135424 = 1227^2 + 368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640953 is a prime.

1640953 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1640053) 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, 820476 + 820477.

It is an arithmetic number, because the mean of its divisors is an integer number (820477).

2^1640953 is an apocalyptic number.

It is an amenable number.

1640953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640953 is an equidigital number, since it uses as much as digits as its factorization.

1640953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 1640953 is about 1280.9968774357. The cubic root of 1640953 is about 117.9502088121.

The spelling of 1640953 in words is "one million, six hundred forty thousand, nine hundred fifty-three".