210400140 has 24 divisors (see below), whose sum is σ = 589120560. Its totient is φ = 56106688.

The previous prime is 210400123. The next prime is 210400181. The reversal of 210400140 is 41004012.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 7 ways as a sum of consecutive naturals, for example, 1753275 + ... + 1753394.

It is an arithmetic number, because the mean of its divisors is an integer number (24546690).

Almost surely, 2^210400140 is an apocalyptic number.

210400140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210400140 is an abundant number, since it is smaller than the sum of its proper divisors (378720420).

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

210400140 is a wasteful number, since it uses less digits than its factorization.

210400140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3506681 (or 3506679 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 210400140 is about 14505.1763174392. The cubic root of 210400140 is about 594.7694797053.

Adding to 210400140 its reverse (41004012), we get a palindrome (251404152).

The spelling of 210400140 in words is "two hundred ten million, four hundred thousand, one hundred forty".