16561340 has 12 divisors (see below), whose sum is σ = 34778856. Its totient is φ = 6624528.

The previous prime is 16561339. The next prime is 16561361. The reversal of 16561340 is 4316561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414014 + ... + 414053.

It is an arithmetic number, because the mean of its divisors is an integer number (2898238).

Almost surely, 2^16561340 is an apocalyptic number.

16561340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16561340 is an abundant number, since it is smaller than the sum of its proper divisors (18217516).

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

16561340 is a wasteful number, since it uses less digits than its factorization.

16561340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828076 (or 828074 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 16561340 is about 4069.5626300624. The cubic root of 16561340 is about 254.8972545188.

The spelling of 16561340 in words is "sixteen million, five hundred sixty-one thousand, three hundred forty".