1640442226 has 8 divisors (see below), whose sum is σ = 2520679644. Its totient is φ = 800215680.

The previous prime is 1640442191. The next prime is 1640442233. The reversal of 1640442226 is 6222440461.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1616442025 + 24000201 = 40205^2 + 4899^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10002615 + ... + 10002778.

Almost surely, 2^1640442226 is an apocalyptic number.

1640442226 is a deficient number, since it is larger than the sum of its proper divisors (880237418).

1640442226 is a wasteful number, since it uses less digits than its factorization.

1640442226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20005436.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 1640442226 is about 40502.3730909684. The cubic root of 1640442226 is about 1179.3796955199.

Adding to 1640442226 its reverse (6222440461), we get a palindrome (7862882687).

The spelling of 1640442226 in words is "one billion, six hundred forty million, four hundred forty-two thousand, two hundred twenty-six".