1389035840 has 28 divisors (see below), whose sum is σ = 3307642356. Its totient is φ = 555614208.

The previous prime is 1389035807. The next prime is 1389035867. The reversal of 1389035840 is 485309831.

It can be written as a sum of positive squares in 2 ways, for example, as 1035294976 + 353740864 = 32176^2 + 18808^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2170049 + ... + 2170688.

Almost surely, 2^1389035840 is an apocalyptic number.

1389035840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1389035840 is an abundant number, since it is smaller than the sum of its proper divisors (1918606516).

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

1389035840 is an equidigital number, since it uses as much as digits as its factorization.

1389035840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4340754 (or 4340744 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 1389035840 is about 37269.7711288921. The cubic root of 1389035840 is about 1115.7609316489.

The spelling of 1389035840 in words is "one billion, three hundred eighty-nine million, thirty-five thousand, eight hundred forty".