16405422 has 48 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 4874320.

The previous prime is 16405421. The next prime is 16405427. The reversal of 16405422 is 22450461.

It is a junction number, because it is equal to n+sod(n) for n = 16405392 and 16405401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16405421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42643 + ... + 43025.

It is an arithmetic number, because the mean of its divisors is an integer number (766080).

Almost surely, 2^16405422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16405422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18385920).

16405422 is an abundant number, since it is smaller than the sum of its proper divisors (20366418).

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

16405422 is a wasteful number, since it uses less digits than its factorization.

16405422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 16405422 is about 4050.3607246763. The cubic root of 16405422 is about 254.0948144591.

Adding to 16405422 its reverse (22450461), we get a palindrome (38855883).

The spelling of 16405422 in words is "sixteen million, four hundred five thousand, four hundred twenty-two".