1399111680 has 120 divisors (see below), whose sum is σ = 4477807152. Its totient is φ = 373030912.

The previous prime is 1399111667. The next prime is 1399111687. The reversal of 1399111680 is 861119931.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×1399111680² = 3915026986224844800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1399111687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242914 + ... + 248606.

Almost surely, 2^1399111680 is an apocalyptic number.

1399111680 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 1399111680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2238903576).

1399111680 is an abundant number, since it is smaller than the sum of its proper divisors (3078695472).

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

1399111680 is an frugal number, since it uses more digits than its factorization.

1399111680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5729 (or 5703 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 1399111680 is about 37404.7013087927. The cubic root of 1399111680 is about 1118.4522839817.

The spelling of 1399111680 in words is "one billion, three hundred ninety-nine million, one hundred eleven thousand, six hundred eighty".