16561140 has 24 divisors (see below), whose sum is σ = 46371360. Its totient is φ = 4416288.

The previous prime is 16561093. The next prime is 16561147. The reversal of 16561140 is 4116561.

It is a self number, because there is not a number n which added to its sum of digits gives 16561140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137950 + ... + 138069.

It is an arithmetic number, because the mean of its divisors is an integer number (1932140).

Almost surely, 2^16561140 is an apocalyptic number.

16561140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16561140 is an abundant number, since it is smaller than the sum of its proper divisors (29810220).

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

16561140 is a wasteful number, since it uses less digits than its factorization.

16561140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276031 (or 276029 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 16561140 is about 4069.5380573230. The cubic root of 16561140 is about 254.8962284413.

The spelling of 16561140 in words is "sixteen million, five hundred sixty-one thousand, one hundred forty".