16400425 has 12 divisors (see below), whose sum is σ = 20529936. Its totient is φ = 12995600.

The previous prime is 16400413. The next prime is 16400429. The reversal of 16400425 is 52400461.

It is not a de Polignac number, because 16400425 - 2¹¹ = 16398377 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16400396 and 16400405.

It is not an unprimeable number, because it can be changed into a prime (16400429) 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, 391 + ... + 5740.

It is an arithmetic number, because the mean of its divisors is an integer number (1710828).

Almost surely, 2^16400425 is an apocalyptic number.

It is an amenable number.

16400425 is a deficient number, since it is larger than the sum of its proper divisors (4129511).

16400425 is a wasteful number, since it uses less digits than its factorization.

16400425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6248 (or 6243 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 16400425 is about 4049.7438190582. The cubic root of 16400425 is about 254.0690132184.

Adding to 16400425 its reverse (52400461), we get a palindrome (68800886).

The spelling of 16400425 in words is "sixteen million, four hundred thousand, four hundred twenty-five".