216257925 has 48 divisors (see below), whose sum is σ = 388100160. Its totient is φ = 105623040.

The previous prime is 216257917. The next prime is 216257927. The reversal of 216257925 is 529752612.

It is not a de Polignac number, because 216257925 - 2³ = 216257917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216257927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132766 + ... + 134384.

It is an arithmetic number, because the mean of its divisors is an integer number (8085420).

Almost surely, 2^216257925 is an apocalyptic number.

216257925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216257925 is a deficient number, since it is larger than the sum of its proper divisors (171842235).

216257925 is a wasteful number, since it uses less digits than its factorization.

216257925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782 (or 1777 counting only the distinct ones).

The product of its digits is 75600, while the sum is 39.

The square root of 216257925 is about 14705.7106254679. The cubic root of 216257925 is about 600.2387244496.

The spelling of 216257925 in words is "two hundred sixteen million, two hundred fifty-seven thousand, nine hundred twenty-five".