139005778 has 4 divisors (see below), whose sum is σ = 208508670. Its totient is φ = 69502888.

The previous prime is 139005773. The next prime is 139005833. The reversal of 139005778 is 877500931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877500931 = 16693 ⋅52567.

It can be written as a sum of positive squares in only one way, i.e., 90383049 + 48622729 = 9507^2 + 6973^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139005778.

It is not an unprimeable number, because it can be changed into a prime (139005773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34751443 + ... + 34751446.

Almost surely, 2^139005778 is an apocalyptic number.

139005778 is a deficient number, since it is larger than the sum of its proper divisors (69502892).

139005778 is an equidigital number, since it uses as much as digits as its factorization.

139005778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69502891.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 139005778 is about 11790.0711617869. The cubic root of 139005778 is about 518.0173242468.

The spelling of 139005778 in words is "one hundred thirty-nine million, five thousand, seven hundred seventy-eight".