209931140 has 24 divisors (see below), whose sum is σ = 450237312. Its totient is φ = 82185440.

The previous prime is 209931131. The next prime is 209931149. The reversal of 209931140 is 41139902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (209931131) and next prime (209931149).

It is not an unprimeable number, because it can be changed into a prime (209931149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110726 + ... + 112605.

It is an arithmetic number, because the mean of its divisors is an integer number (18759888).

Almost surely, 2^209931140 is an apocalyptic number.

209931140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209931140 is an abundant number, since it is smaller than the sum of its proper divisors (240306172).

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

209931140 is a wasteful number, since it uses less digits than its factorization.

209931140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223387 (or 223385 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 209931140 is about 14489.0006556698. Note that the first 3 decimals coincide. The cubic root of 209931140 is about 594.3272201635.

The spelling of 209931140 in words is "two hundred nine million, nine hundred thirty-one thousand, one hundred forty".