1889191955 has 32 divisors (see below), whose sum is σ = 2623933440. Its totient is φ = 1279036800.

The previous prime is 1889191949. The next prime is 1889191957. The reversal of 1889191955 is 5591919881.

It is not a de Polignac number, because 1889191955 - 2¹⁰ = 1889190931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1889191955.

It is not an unprimeable number, because it can be changed into a prime (1889191957) 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 31 ways as a sum of consecutive naturals, for example, 945017 + ... + 947013.

It is an arithmetic number, because the mean of its divisors is an integer number (81997920).

Almost surely, 2^1889191955 is an apocalyptic number.

1889191955 is a deficient number, since it is larger than the sum of its proper divisors (734741485).

1889191955 is a wasteful number, since it uses less digits than its factorization.

1889191955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2339.

The product of its digits is 1166400, while the sum is 56.

The square root of 1889191955 is about 43464.8358446227. The cubic root of 1889191955 is about 1236.2093646153.

The spelling of 1889191955 in words is "one billion, eight hundred eighty-nine million, one hundred ninety-one thousand, nine hundred fifty-five".