1389000040 has 16 divisors (see below), whose sum is σ = 3125250180. Its totient is φ = 555600000.

The previous prime is 1389000031. The next prime is 1389000049. The reversal of 1389000040 is 400009831.

It is an interprime number because it is at equal distance from previous prime (1389000031) and next prime (1389000049).

It can be written as a sum of positive squares in 2 ways, for example, as 1386966564 + 2033476 = 37242^2 + 1426^2 .

It is a super-2 number, since 2×1389000040² = 3858642222240003200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1388999969 and 1389000014.

It is not an unprimeable number, because it can be changed into a prime (1389000049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17362461 + ... + 17362540.

Almost surely, 2^1389000040 is an apocalyptic number.

1389000040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1389000040 is an abundant number, since it is smaller than the sum of its proper divisors (1736250140).

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

1389000040 is a wasteful number, since it uses less digits than its factorization.

1389000040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34725012 (or 34725008 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1389000040 is about 37269.2908438033. The cubic root of 1389000040 is about 1115.7513459628.

Adding to 1389000040 its reverse (400009831), we get a palindrome (1789009871).

The spelling of 1389000040 in words is "one billion, three hundred eighty-nine million, forty", and thus it is an aban number.