210399040 has 28 divisors (see below), whose sum is σ = 501013476. Its totient is φ = 84159488.

The previous prime is 210399037. The next prime is 210399047. The reversal of 210399040 is 40993012.

It is a happy number.

210399040 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 28472896 + 181926144 = 5336^2 + 13488^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210399047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328429 + ... + 329068.

Almost surely, 2^210399040 is an apocalyptic number.

210399040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210399040 is an abundant number, since it is smaller than the sum of its proper divisors (290614436).

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

210399040 is an equidigital number, since it uses as much as digits as its factorization.

210399040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657514 (or 657504 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 210399040 is about 14505.1383998913. The cubic root of 210399040 is about 594.7684431921.

The spelling of 210399040 in words is "two hundred ten million, three hundred ninety-nine thousand, forty".