240109 has 2 divisors, whose sum is σ = 240110. Its totient is φ = 240108.

The previous prime is 240101. The next prime is 240113. The reversal of 240109 is 901042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240100 + 9 = 490^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 240109 - 2³ = 240101 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 240092 and 240101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120054 + 120055.

It is an arithmetic number, because the mean of its divisors is an integer number (120055).

2²⁴⁰¹⁰⁹ is an apocalyptic number.

It is an amenable number.

240109 is a deficient number, since it is larger than the sum of its proper divisors (1).

240109 is an equidigital number, since it uses as much as digits as its factorization.

240109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 240109 is about 490.0091835874. The cubic root of 240109 is about 62.1540567047.

The spelling of 240109 in words is "two hundred forty thousand, one hundred nine".