1641947 has 4 divisors (see below), whose sum is σ = 1713360. Its totient is φ = 1570536.

The previous prime is 1641931. The next prime is 1641953. The reversal of 1641947 is 7491461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7491461 = 109 ⋅68729.

It is a cyclic number.

It is not a de Polignac number, because 1641947 - 2⁴ = 1641931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641907) 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, 35672 + ... + 35717.

It is an arithmetic number, because the mean of its divisors is an integer number (428340).

2^1641947 is an apocalyptic number.

1641947 is a deficient number, since it is larger than the sum of its proper divisors (71413).

1641947 is an equidigital number, since it uses as much as digits as its factorization.

1641947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71412.

The product of its digits is 6048, while the sum is 32.

The square root of 1641947 is about 1281.3847977871. The cubic root of 1641947 is about 117.9740199435.

The spelling of 1641947 in words is "one million, six hundred forty-one thousand, nine hundred forty-seven".