16815140 has 12 divisors (see below), whose sum is σ = 35311836. Its totient is φ = 6726048.

The previous prime is 16815137. The next prime is 16815173. The reversal of 16815140 is 4151861.

It can be written as a sum of positive squares in 2 ways, for example, as 2238016 + 14577124 = 1496^2 + 3818^2 .

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, 420359 + ... + 420398.

It is an arithmetic number, because the mean of its divisors is an integer number (2942653).

Almost surely, 2^16815140 is an apocalyptic number.

16815140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16815140 is an abundant number, since it is smaller than the sum of its proper divisors (18496696).

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

16815140 is a wasteful number, since it uses less digits than its factorization.

16815140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840766 (or 840764 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 16815140 is about 4100.6267813592. The cubic root of 16815140 is about 256.1927462808.

The spelling of 16815140 in words is "sixteen million, eight hundred fifteen thousand, one hundred forty".