1390000000 has 128 divisors (see below), whose sum is σ = 3486319200. Its totient is φ = 552000000.

The previous prime is 1389999959. The next prime is 1390000021. The reversal of 1390000000 is 931.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9999931 + ... + 10000069.

Almost surely, 2^1390000000 is an apocalyptic number.

1390000000 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 1390000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1743159600).

1390000000 is an abundant number, since it is smaller than the sum of its proper divisors (2096319200).

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

1390000000 is an frugal number, since it uses more digits than its factorization.

1390000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 1390000000 is about 37282.7037646145. The cubic root of 1390000000 is about 1116.0190299209.

Adding to 1390000000 its reverse (931), we get a palindrome (1390000931).

The spelling of 1390000000 in words is "one billion, three hundred ninety million", and thus it is an aban number.