1338932778 has 8 divisors (see below), whose sum is σ = 2677865568. Its totient is φ = 446310924.

The previous prime is 1338932759. The next prime is 1338932779. The reversal of 1338932778 is 8772398331.

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

1338932778 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1338932778.

It is not an unprimeable number, because it can be changed into a prime (1338932779) 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 3 ways as a sum of consecutive naturals, for example, 111577726 + ... + 111577737.

It is an arithmetic number, because the mean of its divisors is an integer number (334733196).

Almost surely, 2^1338932778 is an apocalyptic number.

1338932778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1338932778 is a wasteful number, since it uses less digits than its factorization.

1338932778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223155468.

The product of its digits is 1524096, while the sum is 51.

The square root of 1338932778 is about 36591.4303901884. The cubic root of 1338932778 is about 1102.1810110619.

The spelling of 1338932778 in words is "one billion, three hundred thirty-eight million, nine hundred thirty-two thousand, seven hundred seventy-eight".