1396999980 has 96 divisors (see below), whose sum is σ = 4360466880. Its totient is φ = 371312640.

The previous prime is 1396999969. The next prime is 1396999993. The reversal of 1396999980 is 899996931.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167100 + ... + 175260.

It is an arithmetic number, because the mean of its divisors is an integer number (45421530).

Almost surely, 2^1396999980 is an apocalyptic number.

1396999980 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 1396999980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2180233440).

1396999980 is an abundant number, since it is smaller than the sum of its proper divisors (2963466900).

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

1396999980 is a wasteful number, since it uses less digits than its factorization.

1396999980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496 (or 8488 counting only the distinct ones).

The product of its (nonzero) digits is 8503056, while the sum is 63.

The square root of 1396999980 is about 37376.4629145135. The cubic root of 1396999980 is about 1117.8893017765.

The spelling of 1396999980 in words is "one billion, three hundred ninety-six million, nine hundred ninety-nine thousand, nine hundred eighty".