1339641778 has 16 divisors (see below), whose sum is σ = 2122132320. Its totient is φ = 632494656.

The previous prime is 1339641773. The next prime is 1339641811. The reversal of 1339641778 is 8771469331.

It is not an unprimeable number, because it can be changed into a prime (1339641773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45751 + ... + 69082.

It is an arithmetic number, because the mean of its divisors is an integer number (132633270).

Almost surely, 2^1339641778 is an apocalyptic number.

1339641778 is a deficient number, since it is larger than the sum of its proper divisors (782490542).

1339641778 is a wasteful number, since it uses less digits than its factorization.

1339641778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115161.

The product of its digits is 762048, while the sum is 49.

The square root of 1339641778 is about 36601.1171687423. The cubic root of 1339641778 is about 1102.3755213112.

The spelling of 1339641778 in words is "one billion, three hundred thirty-nine million, six hundred forty-one thousand, seven hundred seventy-eight".