1020040139 has 2 divisors, whose sum is σ = 1020040140. Its totient is φ = 1020040138.

The previous prime is 1020040129. The next prime is 1020040157. The reversal of 1020040139 is 9310400201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020040139 - 2⁴ = 1020040123 is a prime.

It is a super-2 number, since 2×1020040139² = 2080963770342278642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1020040139.

It is not a weakly prime, because it can be changed into another prime (1020040129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510020069 + 510020070.

It is an arithmetic number, because the mean of its divisors is an integer number (510020070).

Almost surely, 2^1020040139 is an apocalyptic number.

1020040139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020040139 is an equidigital number, since it uses as much as digits as its factorization.

1020040139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1020040139 is about 31938.0672395810. The cubic root of 1020040139 is about 1006.6359135794.

The spelling of 1020040139 in words is "one billion, twenty million, forty thousand, one hundred thirty-nine".