210255540 has 48 divisors (see below), whose sum is σ = 642237120. Its totient is φ = 50970880.

The previous prime is 210255533. The next prime is 210255553. The reversal of 210255540 is 45552012.

210255540 = 460² + 461² + ... + 899².

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 210255540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158625 + ... + 159944.

It is an arithmetic number, because the mean of its divisors is an integer number (13379940).

Almost surely, 2^210255540 is an apocalyptic number.

210255540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210255540 is an abundant number, since it is smaller than the sum of its proper divisors (431981580).

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

210255540 is a wasteful number, since it uses less digits than its factorization.

210255540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318592 (or 318590 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 210255540 is about 14500.1910332244. The cubic root of 210255540 is about 594.6331943451.

It can be divided in two parts, 21025 and 5540, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 210255540 in words is "two hundred ten million, two hundred fifty-five thousand, five hundred forty".