210420240 has 40 divisors (see below), whose sum is σ = 652303488. Its totient is φ = 56112000.

The previous prime is 210420239. The next prime is 210420277. The reversal of 210420240 is 42024012.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438136 + ... + 438615.

Almost surely, 2^210420240 is an apocalyptic number.

210420240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210420240 is an abundant number, since it is smaller than the sum of its proper divisors (441883248).

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

210420240 is a wasteful number, since it uses less digits than its factorization.

210420240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876767 (or 876761 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 210420240 is about 14505.8691569999. The cubic root of 210420240 is about 594.7884189923.

Adding to 210420240 its reverse (42024012), we get a palindrome (252444252).

The spelling of 210420240 in words is "two hundred ten million, four hundred twenty thousand, two hundred forty".