421878423 has 16 divisors (see below), whose sum is σ = 574179840. Its totient is φ = 275474496.

The previous prime is 421878389. The next prime is 421878427. The reversal of 421878423 is 324878124.

It is not a de Polignac number, because 421878423 - 2¹⁰ = 421877399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421878427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21186 + ... + 35952.

It is an arithmetic number, because the mean of its divisors is an integer number (35886240).

Almost surely, 2^421878423 is an apocalyptic number.

421878423 is a deficient number, since it is larger than the sum of its proper divisors (152301417).

421878423 is a wasteful number, since it uses less digits than its factorization.

421878423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14966.

The product of its digits is 86016, while the sum is 39.

The square root of 421878423 is about 20539.6792331331. The cubic root of 421878423 is about 750.0020284390.

The spelling of 421878423 in words is "four hundred twenty-one million, eight hundred seventy-eight thousand, four hundred twenty-three".