421723879 has 4 divisors (see below), whose sum is σ = 446531184. Its totient is φ = 396916576.

The previous prime is 421723877. The next prime is 421723889. The reversal of 421723879 is 978327124.

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 421723879 - 2¹ = 421723877 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 (421723877) 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, 12403627 + ... + 12403660.

It is an arithmetic number, because the mean of its divisors is an integer number (111632796).

Almost surely, 2^421723879 is an apocalyptic number.

421723879 is a deficient number, since it is larger than the sum of its proper divisors (24807305).

421723879 is a wasteful number, since it uses less digits than its factorization.

421723879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24807304.

The product of its digits is 169344, while the sum is 43.

The square root of 421723879 is about 20535.9168044672. The cubic root of 421723879 is about 749.9104361197.

The spelling of 421723879 in words is "four hundred twenty-one million, seven hundred twenty-three thousand, eight hundred seventy-nine".