1640471233 has 8 divisors (see below), whose sum is σ = 1644893352. Its totient is φ = 1636056576.

The previous prime is 1640471167. The next prime is 1640471263. The reversal of 1640471233 is 3321740461.

It can be written as a sum of positive squares in 4 ways, for example, as 889053489 + 751417744 = 29817^2 + 27412^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1640471233 - 2¹⁷ = 1640340161 is a prime.

It is a super-2 number, since 2×1640471233² = 5382291732601080578, 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 = 1640471195 and 1640471204.

It is not an unprimeable number, because it can be changed into a prime (1640471263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965841 + ... + 967537.

It is an arithmetic number, because the mean of its divisors is an integer number (205611669).

Almost surely, 2^1640471233 is an apocalyptic number.

It is an amenable number.

1640471233 is a deficient number, since it is larger than the sum of its proper divisors (4422119).

1640471233 is a wasteful number, since it uses less digits than its factorization.

1640471233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3731.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 1640471233 is about 40502.7311795143. The cubic root of 1640471233 is about 1179.3866469108.

The spelling of 1640471233 in words is "one billion, six hundred forty million, four hundred seventy-one thousand, two hundred thirty-three".