210444140 has 12 divisors (see below), whose sum is σ = 441932736. Its totient is φ = 84177648.

The previous prime is 210444121. The next prime is 210444161. The reversal of 210444140 is 41444012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 10522207 = 210444140 / (2 + 1 + 0 + 4 + 4 + 4 + 1 + 4 + 0).

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, 5261084 + ... + 5261123.

It is an arithmetic number, because the mean of its divisors is an integer number (36827728).

Almost surely, 2^210444140 is an apocalyptic number.

210444140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210444140 is an abundant number, since it is smaller than the sum of its proper divisors (231488596).

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

210444140 is a wasteful number, since it uses less digits than its factorization.

210444140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10522216 (or 10522214 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 210444140 is about 14506.6929380890. The cubic root of 210444140 is about 594.8109372713.

Adding to 210444140 its reverse (41444012), we get a palindrome (251888152).

The spelling of 210444140 in words is "two hundred ten million, four hundred forty-four thousand, one hundred forty".