1650406 has 4 divisors (see below), whose sum is σ = 2475612. Its totient is φ = 825202.

The previous prime is 1650401. The next prime is 1650413. The reversal of 1650406 is 6040561.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1650401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412600 + ... + 412603.

It is an arithmetic number, because the mean of its divisors is an integer number (618903).

2^1650406 is an apocalyptic number.

1650406 is a deficient number, since it is larger than the sum of its proper divisors (825206).

1650406 is an equidigital number, since it uses as much as digits as its factorization.

1650406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825205.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1650406 is about 1284.6812834318. The cubic root of 1650406 is about 118.1762662983.

Adding to 1650406 its reverse (6040561), we get a palindrome (7690967).

The spelling of 1650406 in words is "one million, six hundred fifty thousand, four hundred six".