16129640 has 16 divisors (see below), whose sum is σ = 36291780. Its totient is φ = 6451840.

The previous prime is 16129627. The next prime is 16129657. The reversal of 16129640 is 4692161.

It can be written as a sum of positive squares in 2 ways, for example, as 14577124 + 1552516 = 3818^2 + 1246^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201581 + ... + 201660.

Almost surely, 2^16129640 is an apocalyptic number.

16129640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16129640 is an abundant number, since it is smaller than the sum of its proper divisors (20162140).

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

16129640 is a wasteful number, since it uses less digits than its factorization.

16129640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403252 (or 403248 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 16129640 is about 4016.1723070605. The cubic root of 16129640 is about 252.6629474633.

The spelling of 16129640 in words is "sixteen million, one hundred twenty-nine thousand, six hundred forty".