16040000 has 70 divisors (see below), whose sum is σ = 39873174. Its totient is φ = 6400000.

The previous prime is 16039963. The next prime is 16040053. The reversal of 16040000 is 4061.

It can be written as a sum of positive squares in 5 ways, for example, as 1721344 + 14318656 = 1312^2 + 3784^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 39800 + ... + 40200.

Almost surely, 2^16040000 is an apocalyptic number.

16040000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19936587).

16040000 is an abundant number, since it is smaller than the sum of its proper divisors (23833174).

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

16040000 is an frugal number, since it uses more digits than its factorization.

16040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 16040000 is about 4004.9968789002. The cubic root of 16040000 is about 252.1940220742.

Adding to 16040000 its reverse (4061), we get a palindrome (16044061).

The spelling of 16040000 in words is "sixteen million, forty thousand".