16530390 has 48 divisors (see below), whose sum is σ = 43698096. Its totient is φ = 4334400.

The previous prime is 16530389. The next prime is 16530401. The reversal of 16530390 is 9303561.

16530390 is a `hidden beast` number, since 1 + 653 + 0 + 3 + 9 + 0 = 666.

It is a congruent number.

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, 3985 + ... + 6995.

It is an arithmetic number, because the mean of its divisors is an integer number (910377).

Almost surely, 2^16530390 is an apocalyptic number.

16530390 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 16530390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21849048).

16530390 is an abundant number, since it is smaller than the sum of its proper divisors (27167706).

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

16530390 is a wasteful number, since it uses less digits than its factorization.

16530390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085 (or 3082 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 27.

The square root of 16530390 is about 4065.7582318677. The cubic root of 16530390 is about 254.7383706458.

The spelling of 16530390 in words is "sixteen million, five hundred thirty thousand, three hundred ninety".