1389889831 has 8 divisors (see below), whose sum is σ = 1518224400. Its totient is φ = 1261885440.

The previous prime is 1389889811. The next prime is 1389889849.

1389889831 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1389889831 - 2⁵ = 1389889799 is a prime.

It is a super-2 number, since 2×1389889831² = 3863587484634417122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389889811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73696 + ... + 90613.

It is an arithmetic number, because the mean of its divisors is an integer number (189778050).

Almost surely, 2^1389889831 is an apocalyptic number.

1389889831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1389889831 is a deficient number, since it is larger than the sum of its proper divisors (128334569).

1389889831 is a wasteful number, since it uses less digits than its factorization.

1389889831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165089.

The product of its digits is 2985984, while the sum is 58.

The square root of 1389889831 is about 37281.2262539740. The cubic root of 1389889831 is about 1115.9895445615.

The spelling of 1389889831 in words is "one billion, three hundred eighty-nine million, eight hundred eighty-nine thousand, eight hundred thirty-one".