16878340 has 24 divisors (see below), whose sum is σ = 35544600. Its totient is φ = 6732288.

The previous prime is 16878313. The next prime is 16878341. The reversal of 16878340 is 4387861.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1149184 + 15729156 = 1072^2 + 3966^2 .

It is a super-2 number, since 2×16878340² = 569756722311200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16878340.

It is not an unprimeable number, because it can be changed into a prime (16878341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7686 + ... + 9634.

It is an arithmetic number, because the mean of its divisors is an integer number (1481025).

Almost surely, 2^16878340 is an apocalyptic number.

16878340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16878340 is an abundant number, since it is smaller than the sum of its proper divisors (18666260).

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

16878340 is a wasteful number, since it uses less digits than its factorization.

16878340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391 (or 2389 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 16878340 is about 4108.3256930287. The cubic root of 16878340 is about 256.5133133138.

The spelling of 16878340 in words is "sixteen million, eight hundred seventy-eight thousand, three hundred forty".