16440001400 has 48 divisors (see below), whose sum is σ = 39541051800. Its totient is φ = 6349239680.

The previous prime is 16440001381. The next prime is 16440001439. The reversal of 16440001400 is 410004461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1411442 + ... + 1423041.

Almost surely, 2^16440001400 is an apocalyptic number.

16440001400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16440001400 is an abundant number, since it is smaller than the sum of its proper divisors (23101050400).

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

16440001400 is a wasteful number, since it uses less digits than its factorization.

16440001400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834528 (or 2834519 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 16440001400 its reverse (410004461), we get a palindrome (16850005861).

The spelling of 16440001400 in words is "sixteen billion, four hundred forty million, one thousand, four hundred".