16129440 has 144 divisors (see below), whose sum is σ = 57552768. Its totient is φ = 4105728.

The previous prime is 16129411. The next prime is 16129471. The reversal of 16129440 is 4492161.

16129440 is a `hidden beast` number, since 1 + 612 + 9 + 4 + 40 = 666.

16129440 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32877 + ... + 33363.

It is an arithmetic number, because the mean of its divisors is an integer number (399672).

Almost surely, 2^16129440 is an apocalyptic number.

16129440 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 16129440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28776384).

16129440 is an abundant number, since it is smaller than the sum of its proper divisors (41423328).

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

16129440 is a wasteful number, since it uses less digits than its factorization.

16129440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 16129440 is about 4016.1474076533. The cubic root of 16129440 is about 252.6619031582.

The spelling of 16129440 in words is "sixteen million, one hundred twenty-nine thousand, four hundred forty".