16425 has 18 divisors (see below), whose sum is σ = 29822. Its totient is φ = 8640.

The previous prime is 16421. The next prime is 16427. The reversal of 16425 is 52461.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1296 + 15129 = 36^2 + 123^2 .

It is not a de Polignac number, because 16425 - 2² = 16421 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16398 and 16407.

It is not an unprimeable number, because it can be changed into a prime (16421) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 189 + ... + 261.

2¹⁶⁴²⁵ is an apocalyptic number.

16425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16425 is a deficient number, since it is larger than the sum of its proper divisors (13397).

16425 is a wasteful number, since it uses less digits than its factorization.

16425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 81 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 16425 is about 128.1600561798. The cubic root of 16425 is about 25.4195852004.

Adding to 16425 its reverse (52461), we get a palindrome (68886).

It can be divided in two parts, 16 and 425, that added together give a square (441 = 21²).

The spelling of 16425 in words is "sixteen thousand, four hundred twenty-five".