1889400055 has 4 divisors (see below), whose sum is σ = 2267280072. Its totient is φ = 1511520040.

The previous prime is 1889400053. The next prime is 1889400061. The reversal of 1889400055 is 5500049881.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1889400055 - 2¹ = 1889400053 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1889399990 and 1889400017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1889400053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188940001 + ... + 188940010.

It is an arithmetic number, because the mean of its divisors is an integer number (566820018).

Almost surely, 2^1889400055 is an apocalyptic number.

1889400055 is a deficient number, since it is larger than the sum of its proper divisors (377880017).

1889400055 is an equidigital number, since it uses as much as digits as its factorization.

1889400055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377880016.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 1889400055 is about 43467.2296678774. The cubic root of 1889400055 is about 1236.2547536369.

The spelling of 1889400055 in words is "one billion, eight hundred eighty-nine million, four hundred thousand, fifty-five".