16401408 has 88 divisors (see below), whose sum is σ = 46180320. Its totient is φ = 5160960.

The previous prime is 16401403. The next prime is 16401419. The reversal of 16401408 is 80410461.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 8 and base 16.

It is not an unprimeable number, because it can be changed into a prime (16401403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58228 + ... + 58508.

Almost surely, 2^16401408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16401408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23090160).

16401408 is an abundant number, since it is smaller than the sum of its proper divisors (29778912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16401408 is a wasteful number, since it uses less digits than its factorization.

16401408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 16401408 is about 4049.8651829413. The cubic root of 16401408 is about 254.0740892017.

Adding to 16401408 its reverse (80410461), we get a palindrome (96811869).

The spelling of 16401408 in words is "sixteen million, four hundred one thousand, four hundred eight".