240398181 has 12 divisors (see below), whose sum is σ = 347384908. Its totient is φ = 160199424.

The previous prime is 240398177. The next prime is 240398201. The reversal of 240398181 is 181893042.

It can be written as a sum of positive squares in 2 ways, for example, as 11329956 + 229068225 = 3366^2 + 15135^2 .

It is not a de Polignac number, because 240398181 - 2² = 240398177 is a prime.

It is a super-2 number, since 2×240398181² = 115582570856217522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240398111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28821 + ... + 36213.

Almost surely, 2^240398181 is an apocalyptic number.

It is an amenable number.

240398181 is a deficient number, since it is larger than the sum of its proper divisors (106986727).

240398181 is a wasteful number, since it uses less digits than its factorization.

240398181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11012 (or 11009 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 240398181 is about 15504.7792954302. The cubic root of 240398181 is about 621.7899893425.

The spelling of 240398181 in words is "two hundred forty million, three hundred ninety-eight thousand, one hundred eighty-one".