16400012 has 12 divisors (see below), whose sum is σ = 29948016. Its totient is φ = 7843440.

The previous prime is 16399987. The next prime is 16400017. The reversal of 16400012 is 21000461.

It is a self number, because there is not a number n which added to its sum of digits gives 16400012.

It is not an unprimeable number, because it can be changed into a prime (16400017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89039 + ... + 89222.

It is an arithmetic number, because the mean of its divisors is an integer number (2495668).

Almost surely, 2^16400012 is an apocalyptic number.

It is an amenable number.

16400012 is a deficient number, since it is larger than the sum of its proper divisors (13548004).

16400012 is a wasteful number, since it uses less digits than its factorization.

16400012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178288 (or 178286 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 16400012 is about 4049.6928278574. The cubic root of 16400012 is about 254.0668805220.

Adding to 16400012 its reverse (21000461), we get a palindrome (37400473).

The spelling of 16400012 in words is "sixteen million, four hundred thousand, twelve".