1640226 has 32 divisors (see below), whose sum is σ = 3830400. Its totient is φ = 468048.

The previous prime is 1640207. The next prime is 1640231. The reversal of 1640226 is 6220461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1660 + ... + 2456.

It is an arithmetic number, because the mean of its divisors is an integer number (119700).

2^1640226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1915200).

1640226 is an abundant number, since it is smaller than the sum of its proper divisors (2190174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640226 is an equidigital number, since it uses as much as digits as its factorization.

1640226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823 (or 809 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1640226 is about 1280.7130826223. The cubic root of 1640226 is about 117.9327875396.

Adding to 1640226 its reverse (6220461), we get a palindrome (7860687).

The spelling of 1640226 in words is "one million, six hundred forty thousand, two hundred twenty-six".