1392981720 has 256 divisors, whose sum is σ = 4644864000. Its totient is φ = 332107776.

The previous prime is 1392981719. The next prime is 1392981721. The reversal of 1392981720 is 271892931.

It is an interprime number because it is at equal distance from previous prime (1392981719) and next prime (1392981721).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392981721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10968297 + ... + 10968423.

It is an arithmetic number, because the mean of its divisors is an integer number (18144000).

Almost surely, 2^1392981720 is an apocalyptic number.

1392981720 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 1392981720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2322432000).

1392981720 is an abundant number, since it is smaller than the sum of its proper divisors (3251882280).

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

1392981720 is a wasteful number, since it uses less digits than its factorization.

1392981720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1392981720 is about 37322.6703224729. The cubic root of 1392981720 is about 1116.8164591016.

The spelling of 1392981720 in words is "one billion, three hundred ninety-two million, nine hundred eighty-one thousand, seven hundred twenty".