1240204139 has 2 divisors, whose sum is σ = 1240204140. Its totient is φ = 1240204138.

The previous prime is 1240204123. The next prime is 1240204159. The reversal of 1240204139 is 9314020421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1240204139 - 2⁴ = 1240204123 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240204159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620102069 + 620102070.

It is an arithmetic number, because the mean of its divisors is an integer number (620102070).

Almost surely, 2^1240204139 is an apocalyptic number.

1240204139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240204139 is an equidigital number, since it uses as much as digits as its factorization.

1240204139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1240204139 is about 35216.5321830529. The cubic root of 1240204139 is about 1074.3960231560.

It can be divided in two parts, 1240 and 204139, that added together give a cube (205379 = 59³).

The spelling of 1240204139 in words is "one billion, two hundred forty million, two hundred four thousand, one hundred thirty-nine".