1078720139 has 8 divisors (see below), whose sum is σ = 1246675680. Its totient is φ = 914227776.

The previous prime is 1078720061. The next prime is 1078720141. The reversal of 1078720139 is 9310278701.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1078720139 - 2¹² = 1078716043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1078720169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865124 + ... + 866369.

It is an arithmetic number, because the mean of its divisors is an integer number (155834460).

Almost surely, 2^1078720139 is an apocalyptic number.

1078720139 is a deficient number, since it is larger than the sum of its proper divisors (167955541).

1078720139 is an equidigital number, since it uses as much as digits as its factorization.

1078720139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731589.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 1078720139 is about 32843.8752128917. The cubic root of 1078720139 is about 1025.5801241901.

The spelling of 1078720139 in words is "one billion, seventy-eight million, seven hundred twenty thousand, one hundred thirty-nine".