1640211226 has 16 divisors (see below), whose sum is σ = 2481387840. Its totient is φ = 813103200.

The previous prime is 1640211211. The next prime is 1640211241. The reversal of 1640211226 is 6221120461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1640211211) and next prime (1640211241).

It is a self number, because there is not a number n which added to its sum of digits gives 1640211226.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160230 + ... + 170158.

It is an arithmetic number, because the mean of its divisors is an integer number (155086740).

Almost surely, 2^1640211226 is an apocalyptic number.

1640211226 is a deficient number, since it is larger than the sum of its proper divisors (841176614).

1640211226 is a wasteful number, since it uses less digits than its factorization.

1640211226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10629.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1640211226 is about 40499.5213058130. The cubic root of 1640211226 is about 1179.3243345337.

Adding to 1640211226 its reverse (6221120461), we get a palindrome (7861331687).

The spelling of 1640211226 in words is "one billion, six hundred forty million, two hundred eleven thousand, two hundred twenty-six".