1399943880 has 384 divisors, whose sum is σ = 5111009280. Its totient is φ = 330670080.

The previous prime is 1399943869. The next prime is 1399943899. The reversal of 1399943880 is 883499931.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8916762 + ... + 8916918.

It is an arithmetic number, because the mean of its divisors is an integer number (13309920).

Almost surely, 2^1399943880 is an apocalyptic number.

1399943880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399943880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2555504640).

1399943880 is an abundant number, since it is smaller than the sum of its proper divisors (3711065400).

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

1399943880 is a wasteful number, since it uses less digits than its factorization.

1399943880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The square root of 1399943880 is about 37415.8239251790. The cubic root of 1399943880 is about 1118.6739940666.

The spelling of 1399943880 in words is "one billion, three hundred ninety-nine million, nine hundred forty-three thousand, eight hundred eighty".