16251990 has 64 divisors (see below), whose sum is σ = 40727232. Its totient is φ = 4147200.

The previous prime is 16251953. The next prime is 16251997. The reversal of 16251990 is 9915261.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16251997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89700 + ... + 89880.

It is an arithmetic number, because the mean of its divisors is an integer number (636363).

Almost surely, 2^16251990 is an apocalyptic number.

16251990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16251990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20363616).

16251990 is an abundant number, since it is smaller than the sum of its proper divisors (24475242).

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

16251990 is a wasteful number, since it uses less digits than its factorization.

16251990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 16251990 is about 4031.3756957148. The cubic root of 16251990 is about 253.3001899546.

The spelling of 16251990 in words is "sixteen million, two hundred fifty-one thousand, nine hundred ninety".