1389811815 has 48 divisors (see below), whose sum is σ = 2817205248. Its totient is φ = 620561088.

The previous prime is 1389811799. The next prime is 1389811877. The reversal of 1389811815 is 5181189831.

It is not a de Polignac number, because 1389811815 - 2⁴ = 1389811799 is a prime.

It is a super-2 number, since 2×1389811815² = 3863153762227188450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 37759 + ... + 64848.

It is an arithmetic number, because the mean of its divisors is an integer number (58691776).

Almost surely, 2^1389811815 is an apocalyptic number.

1389811815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1389811815 is an abundant number, since it is smaller than the sum of its proper divisors (1427393433).

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

1389811815 is a wasteful number, since it uses less digits than its factorization.

1389811815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102668 (or 102665 counting only the distinct ones).

The product of its digits is 69120, while the sum is 45.

The square root of 1389811815 is about 37280.1799217761. The cubic root of 1389811815 is about 1115.9686636093.

The spelling of 1389811815 in words is "one billion, three hundred eighty-nine million, eight hundred eleven thousand, eight hundred fifteen".