4018923821 has 4 divisors (see below), whose sum is σ = 4384280544. Its totient is φ = 3653567100.

The previous prime is 4018923773. The next prime is 4018923841. The reversal of 4018923821 is 1283298104.

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 4018923821 - 2²⁶ = 3951814957 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 (4018923841) 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, 182678345 + ... + 182678366.

It is an arithmetic number, because the mean of its divisors is an integer number (1096070136).

Almost surely, 2^4018923821 is an apocalyptic number.

It is an amenable number.

4018923821 is a deficient number, since it is larger than the sum of its proper divisors (365356723).

4018923821 is a wasteful number, since it uses less digits than its factorization.

4018923821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365356722.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 4018923821 is about 63394.9826169232. The cubic root of 4018923821 is about 1589.9004224125.

The spelling of 4018923821 in words is "four billion, eighteen million, nine hundred twenty-three thousand, eight hundred twenty-one".