1640472343 has 2 divisors, whose sum is σ = 1640472344. Its totient is φ = 1640472342.

The previous prime is 1640472313. The next prime is 1640472347. The reversal of 1640472343 is 3432740461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640472343 - 2⁵ = 1640472311 is a prime.

It is a super-2 number, since 2×1640472343² = 5382299016295819298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1640472299 and 1640472308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640472347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820236171 + 820236172.

It is an arithmetic number, because the mean of its divisors is an integer number (820236172).

Almost surely, 2^1640472343 is an apocalyptic number.

1640472343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640472343 is an equidigital number, since it uses as much as digits as its factorization.

1640472343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 1640472343 is about 40502.7448822916. The cubic root of 1640472343 is about 1179.3869129154.

The spelling of 1640472343 in words is "one billion, six hundred forty million, four hundred seventy-two thousand, three hundred forty-three".