1399009140 has 144 divisors (see below), whose sum is σ = 4503582720. Its totient is φ = 350542080.

The previous prime is 1399009133. The next prime is 1399009163. The reversal of 1399009140 is 419009931.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1399009095 and 1399009104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 432730 + ... + 435950.

It is an arithmetic number, because the mean of its divisors is an integer number (31274880).

Almost surely, 2^1399009140 is an apocalyptic number.

1399009140 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 1399009140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2251791360).

1399009140 is an abundant number, since it is smaller than the sum of its proper divisors (3104573580).

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

1399009140 is a wasteful number, since it uses less digits than its factorization.

1399009140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3382 (or 3377 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 1399009140 is about 37403.3306003623. The cubic root of 1399009140 is about 1118.4249597633.

The spelling of 1399009140 in words is "one billion, three hundred ninety-nine million, nine thousand, one hundred forty".