16405225 has 12 divisors (see below), whose sum is σ = 20506624. Its totient is φ = 13018320.

The previous prime is 16405201. The next prime is 16405229. The reversal of 16405225 is 52250461.

It is not a de Polignac number, because 16405225 - 2¹³ = 16397033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16405225.

It is not an unprimeable number, because it can be changed into a prime (16405229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 592 + ... + 5758.

Almost surely, 2^16405225 is an apocalyptic number.

It is an amenable number.

16405225 is a deficient number, since it is larger than the sum of its proper divisors (4101399).

16405225 is a wasteful number, since it uses less digits than its factorization.

16405225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5304 (or 5299 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 16405225 is about 4050.3364057816. The cubic root of 16405225 is about 254.0937973791.

Adding to 16405225 its reverse (52250461), we get a palindrome (68655686).

The spelling of 16405225 in words is "sixteen million, four hundred five thousand, two hundred twenty-five".