216425 has 12 divisors (see below), whose sum is σ = 293136. Its totient is φ = 157200.

The previous prime is 216421. The next prime is 216431. The reversal of 216425 is 524612.

It is a happy number.

It is not a de Polignac number, because 216425 - 2² = 216421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216397 and 216406.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216425.

It is not an unprimeable number, because it can be changed into a prime (216421) 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, 119 + ... + 668.

It is an arithmetic number, because the mean of its divisors is an integer number (24428).

2²¹⁶⁴²⁵ is an apocalyptic number.

216425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216425 is a deficient number, since it is larger than the sum of its proper divisors (76711).

216425 is a wasteful number, since it uses less digits than its factorization.

216425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 803 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 216425 is about 465.2150040573. The cubic root of 216425 is about 60.0393260706.

It can be divided in two parts, 21 and 6425, that added together give a palindrome (6446).

The spelling of 216425 in words is "two hundred sixteen thousand, four hundred twenty-five".