1389896891 has 8 divisors (see below), whose sum is σ = 1453982400. Its totient is φ = 1326888640.

The previous prime is 1389896881. The next prime is 1389896909. The reversal of 1389896891 is 1986989831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389896891 is a prime.

It is a super-2 number, since 2×1389896891² = 3863626735222931762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389896881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266675 + ... + 271836.

It is an arithmetic number, because the mean of its divisors is an integer number (181747800).

Almost surely, 2^1389896891 is an apocalyptic number.

1389896891 is a deficient number, since it is larger than the sum of its proper divisors (64085509).

1389896891 is an equidigital number, since it uses as much as digits as its factorization.

1389896891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538629.

The product of its digits is 6718464, while the sum is 62.

The square root of 1389896891 is about 37281.3209395805. The cubic root of 1389896891 is about 1115.9914341292.

The spelling of 1389896891 in words is "one billion, three hundred eighty-nine million, eight hundred ninety-six thousand, eight hundred ninety-one".