1399400730 has 576 divisors, whose sum is σ = 5217488640. Its totient is φ = 251817984.

The previous prime is 1399400719. The next prime is 1399400759. The reversal of 1399400730 is 370049931.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 60843499 + ... + 60843521.

It is an arithmetic number, because the mean of its divisors is an integer number (9058140).

Almost surely, 2^1399400730 is an apocalyptic number.

1399400730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399400730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2608744320).

1399400730 is an abundant number, since it is smaller than the sum of its proper divisors (3818087910).

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

1399400730 is a wasteful number, since it uses less digits than its factorization.

1399400730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 1399400730 is about 37408.5649283690. The cubic root of 1399400730 is about 1118.5293010339.

The spelling of 1399400730 in words is "one billion, three hundred ninety-nine million, four hundred thousand, seven hundred thirty".