1640473441 has 4 divisors (see below), whose sum is σ = 1640634372. Its totient is φ = 1640312512.

The previous prime is 1640473399. The next prime is 1640473451. The reversal of 1640473441 is 1443740461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1169366416 + 471107025 = 34196^2 + 21705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640473441 - 2⁷ = 1640473313 is a prime.

It is a super-2 number, since 2×1640473441² = 5382306221252760962, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640473397 and 1640473406.

It is not an unprimeable number, because it can be changed into a prime (1640473451) 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, 64060 + ... + 85933.

It is an arithmetic number, because the mean of its divisors is an integer number (410158593).

Almost surely, 2^1640473441 is an apocalyptic number.

It is an amenable number.

1640473441 is a deficient number, since it is larger than the sum of its proper divisors (160931).

1640473441 is a wasteful number, since it uses less digits than its factorization.

1640473441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160930.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 1640473441 is about 40502.7584369262. The cubic root of 1640473441 is about 1179.3871760442.

The spelling of 1640473441 in words is "one billion, six hundred forty million, four hundred seventy-three thousand, four hundred forty-one".