16823540 has 24 divisors (see below), whose sum is σ = 37408392. Its totient is φ = 6333440.

The previous prime is 16823539. The next prime is 16823549. The reversal of 16823540 is 4532861.

It can be written as a sum of positive squares in 4 ways, for example, as 1157776 + 15665764 = 1076^2 + 3958^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16823549) 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, 24401 + ... + 25080.

It is an arithmetic number, because the mean of its divisors is an integer number (1558683).

Almost surely, 2^16823540 is an apocalyptic number.

16823540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16823540 is an abundant number, since it is smaller than the sum of its proper divisors (20584852).

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

16823540 is a wasteful number, since it uses less digits than its factorization.

16823540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49507 (or 49505 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 16823540 is about 4101.6508871429. The cubic root of 16823540 is about 256.2353995250.

The spelling of 16823540 in words is "sixteen million, eight hundred twenty-three thousand, five hundred forty".