1640146 has 4 divisors (see below), whose sum is σ = 2460222. Its totient is φ = 820072.

The previous prime is 1640131. The next prime is 1640147. The reversal of 1640146 is 6410461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6410461 = 2287 ⋅2803.

It can be written as a sum of positive squares in only one way, i.e., 1525225 + 114921 = 1235^2 + 339^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1640147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410035 + ... + 410038.

2^1640146 is an apocalyptic number.

1640146 is a deficient number, since it is larger than the sum of its proper divisors (820076).

1640146 is an equidigital number, since it uses as much as digits as its factorization.

1640146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820075.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1640146 is about 1280.6818496410. The cubic root of 1640146 is about 117.9308701663.

The spelling of 1640146 in words is "one million, six hundred forty thousand, one hundred forty-six".