16640022 has 32 divisors (see below), whose sum is σ = 38304000. Its totient is φ = 4720608.

The previous prime is 16640003. The next prime is 16640023. The reversal of 16640022 is 22004661.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4929 + ... + 7587.

It is an arithmetic number, because the mean of its divisors is an integer number (1197000).

Almost surely, 2^16640022 is an apocalyptic number.

16640022 is an abundant number, since it is smaller than the sum of its proper divisors (21663978).

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

16640022 is a wasteful number, since it uses less digits than its factorization.

16640022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820.

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

The square root of 16640022 is about 4079.2183074702. The cubic root of 16640022 is about 255.3002844664.

Adding to 16640022 its reverse (22004661), we get a palindrome (38644683).

The spelling of 16640022 in words is "sixteen million, six hundred forty thousand, twenty-two".