1339907778 has 192 divisors, whose sum is σ = 3539289600. Its totient is φ = 374220000.

The previous prime is 1339907753. The next prime is 1339907791. The reversal of 1339907778 is 8777099331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 5338153 + ... + 5338403.

It is an arithmetic number, because the mean of its divisors is an integer number (18433800).

Almost surely, 2^1339907778 is an apocalyptic number.

1339907778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1339907778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769644800).

1339907778 is an abundant number, since it is smaller than the sum of its proper divisors (2199381822).

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

1339907778 is a wasteful number, since it uses less digits than its factorization.

1339907778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 2000376, while the sum is 54.

The square root of 1339907778 is about 36604.7507572446. The cubic root of 1339907778 is about 1102.4484792436.

The spelling of 1339907778 in words is "one billion, three hundred thirty-nine million, nine hundred seven thousand, seven hundred seventy-eight".