1911872423 has 4 divisors (see below), whose sum is σ = 1912003368. Its totient is φ = 1911741480.

The previous prime is 1911872383. The next prime is 1911872429. The reversal of 1911872423 is 3242781191.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3242781191 = 13 ⋅249444707.

It is a cyclic number.

It is not a de Polignac number, because 1911872423 - 2¹² = 1911868327 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 (1911872429) 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, 40361 + ... + 73842.

It is an arithmetic number, because the mean of its divisors is an integer number (478000842).

Almost surely, 2^1911872423 is an apocalyptic number.

1911872423 is a deficient number, since it is larger than the sum of its proper divisors (130945).

1911872423 is a wasteful number, since it uses less digits than its factorization.

1911872423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130944.

The product of its digits is 24192, while the sum is 38.

The square root of 1911872423 is about 43724.9633847760. The cubic root of 1911872423 is about 1241.1367530609.

The spelling of 1911872423 in words is "one billion, nine hundred eleven million, eight hundred seventy-two thousand, four hundred twenty-three".