1555873923 has 4 divisors (see below), whose sum is σ = 2074498568. Its totient is φ = 1037249280.

The previous prime is 1555873903. The next prime is 1555873981. The reversal of 1555873923 is 3293785551.

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

It is not a de Polignac number, because 1555873923 - 2⁸ = 1555873667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1555873903) 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, 259312318 + ... + 259312323.

It is an arithmetic number, because the mean of its divisors is an integer number (518624642).

Almost surely, 2^1555873923 is an apocalyptic number.

1555873923 is a deficient number, since it is larger than the sum of its proper divisors (518624645).

1555873923 is an equidigital number, since it uses as much as digits as its factorization.

1555873923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518624644.

The product of its digits is 1134000, while the sum is 48.

The square root of 1555873923 is about 39444.5677248465. The cubic root of 1555873923 is about 1158.7545895977.

The spelling of 1555873923 in words is "one billion, five hundred fifty-five million, eight hundred seventy-three thousand, nine hundred twenty-three".