1234843921 has 4 divisors (see below), whose sum is σ = 1234970352. Its totient is φ = 1234717492.

The previous prime is 1234843913. The next prime is 1234843931. The reversal of 1234843921 is 1293484321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1234843921 - 2³ = 1234843913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1234843901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47215 + ... + 68548.

It is an arithmetic number, because the mean of its divisors is an integer number (308742588).

Almost surely, 2^1234843921 is an apocalyptic number.

It is an amenable number.

1234843921 is a deficient number, since it is larger than the sum of its proper divisors (126431).

1234843921 is a wasteful number, since it uses less digits than its factorization.

1234843921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126430.

The product of its digits is 41472, while the sum is 37.

The square root of 1234843921 is about 35140.3460569187. The cubic root of 1234843921 is about 1072.8459251838.

The spelling of 1234843921 in words is "one billion, two hundred thirty-four million, eight hundred forty-three thousand, nine hundred twenty-one".