1389952861 has 16 divisors (see below), whose sum is σ = 1660875840. Its totient is φ = 1148250880.

The previous prime is 1389952853. The next prime is 1389952903. The reversal of 1389952861 is 1682599831.

It is a cyclic number.

It is not a de Polignac number, because 1389952861 - 2³ = 1389952853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1389952799 and 1389952808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389952561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122731 + ... + 133576.

It is an arithmetic number, because the mean of its divisors is an integer number (103804740).

Almost surely, 2^1389952861 is an apocalyptic number.

1389952861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1389952861 is a deficient number, since it is larger than the sum of its proper divisors (270922979).

1389952861 is a wasteful number, since it uses less digits than its factorization.

1389952861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256364.

The product of its digits is 933120, while the sum is 52.

The square root of 1389952861 is about 37282.0715760270. The cubic root of 1389952861 is about 1116.0064139459.

The spelling of 1389952861 in words is "one billion, three hundred eighty-nine million, nine hundred fifty-two thousand, eight hundred sixty-one".