1889434391 has 16 divisors (see below), whose sum is σ = 2047146528. Its totient is φ = 1733529600.

The previous prime is 1889434387. The next prime is 1889434403. The reversal of 1889434391 is 1934349881.

It is a cyclic number.

It is not a de Polignac number, because 1889434391 - 2² = 1889434387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1889434301) 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, 2482451 + ... + 2483211.

It is an arithmetic number, because the mean of its divisors is an integer number (127946658).

Almost surely, 2^1889434391 is an apocalyptic number.

1889434391 is a deficient number, since it is larger than the sum of its proper divisors (157712137).

1889434391 is a wasteful number, since it uses less digits than its factorization.

1889434391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682.

The product of its digits is 746496, while the sum is 50.

The square root of 1889434391 is about 43467.6246302924. The cubic root of 1889434391 is about 1236.2622423961.

The spelling of 1889434391 in words is "one billion, eight hundred eighty-nine million, four hundred thirty-four thousand, three hundred ninety-one".