1399359840 has 192 divisors, whose sum is σ = 4586803200. Its totient is φ = 358225920.

The previous prime is 1399359827. The next prime is 1399359847. The reversal of 1399359840 is 489539931.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399359847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2335861 + ... + 2336459.

It is an arithmetic number, because the mean of its divisors is an integer number (23889600).

Almost surely, 2^1399359840 is an apocalyptic number.

1399359840 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 1399359840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2293401600).

1399359840 is an abundant number, since it is smaller than the sum of its proper divisors (3187443360).

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

1399359840 is a wasteful number, since it uses less digits than its factorization.

1399359840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 51.

The square root of 1399359840 is about 37408.0183917833. The cubic root of 1399359840 is about 1118.5184065828.

The spelling of 1399359840 in words is "one billion, three hundred ninety-nine million, three hundred fifty-nine thousand, eight hundred forty".