1921914623 has 4 divisors (see below), whose sum is σ = 1922053128. Its totient is φ = 1921776120.

The previous prime is 1921914613. The next prime is 1921914671. The reversal of 1921914623 is 3264191291.

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

It is a cyclic number.

It is not a de Polignac number, because 1921914623 - 2⁶ = 1921914559 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 (1921914613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45788 + ... + 77073.

It is an arithmetic number, because the mean of its divisors is an integer number (480513282).

Almost surely, 2^1921914623 is an apocalyptic number.

1921914623 is a deficient number, since it is larger than the sum of its proper divisors (138505).

1921914623 is a wasteful number, since it uses less digits than its factorization.

1921914623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138504.

The product of its digits is 23328, while the sum is 38.

The square root of 1921914623 is about 43839.6467024998. The cubic root of 1921914623 is about 1243.3060025490.

The spelling of 1921914623 in words is "one billion, nine hundred twenty-one million, nine hundred fourteen thousand, six hundred twenty-three".