423979811 has 4 divisors (see below), whose sum is σ = 434320824. Its totient is φ = 413638800.

The previous prime is 423979799. The next prime is 423979859. The reversal of 423979811 is 118979324.

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 423979811 - 2²⁶ = 356870947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423979211) 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, 5170445 + ... + 5170526.

It is an arithmetic number, because the mean of its divisors is an integer number (108580206).

Almost surely, 2^423979811 is an apocalyptic number.

423979811 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

423979811 is a deficient number, since it is larger than the sum of its proper divisors (10341013).

423979811 is a wasteful number, since it uses less digits than its factorization.

423979811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10341012.

The product of its digits is 108864, while the sum is 44.

The square root of 423979811 is about 20590.7700438813. The cubic root of 423979811 is about 751.2452268101.

The spelling of 423979811 in words is "four hundred twenty-three million, nine hundred seventy-nine thousand, eight hundred eleven".