1938871955 has 4 divisors (see below), whose sum is σ = 2326646352. Its totient is φ = 1551097560.

The previous prime is 1938871933. The next prime is 1938871997. The reversal of 1938871955 is 5591788391.

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

It is not a de Polignac number, because 1938871955 - 2⁸ = 1938871699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1938871955.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193887191 + ... + 193887200.

It is an arithmetic number, because the mean of its divisors is an integer number (581661588).

Almost surely, 2^1938871955 is an apocalyptic number.

1938871955 is a deficient number, since it is larger than the sum of its proper divisors (387774397).

1938871955 is an equidigital number, since it uses as much as digits as its factorization.

1938871955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387774396.

The product of its digits is 2721600, while the sum is 56.

The square root of 1938871955 is about 44032.6237578457. The cubic root of 1938871955 is about 1246.9519238267.

The spelling of 1938871955 in words is "one billion, nine hundred thirty-eight million, eight hundred seventy-one thousand, nine hundred fifty-five".