1622406 has 16 divisors (see below), whose sum is σ = 3258864. Its totient is φ = 538464.

The previous prime is 1622377. The next prime is 1622407. The reversal of 1622406 is 6042261.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1622407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1476 + ... + 2328.

It is an arithmetic number, because the mean of its divisors is an integer number (203679).

2^1622406 is an apocalyptic number.

1622406 is an abundant number, since it is smaller than the sum of its proper divisors (1636458).

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

1622406 is a wasteful number, since it uses less digits than its factorization.

1622406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175.

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

The square root of 1622406 is about 1273.7370215237. The cubic root of 1622406 is about 117.5041435086.

Adding to 1622406 its reverse (6042261), we get a palindrome (7664667).

It can be divided in two parts, 16 and 22406, that added together give a palindrome (22422).

The spelling of 1622406 in words is "one million, six hundred twenty-two thousand, four hundred six".