423642840 has 64 divisors (see below), whose sum is σ = 1275372000. Its totient is φ = 112576512.

The previous prime is 423642827. The next prime is 423642841. The reversal of 423642840 is 48246324.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423642841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29136 + ... + 41184.

Almost surely, 2^423642840 is an apocalyptic number.

423642840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423642840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637686000).

423642840 is an abundant number, since it is smaller than the sum of its proper divisors (851729160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

423642840 is a wasteful number, since it uses less digits than its factorization.

423642840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12356 (or 12352 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 33.

The square root of 423642840 is about 20582.5858433774. The cubic root of 423642840 is about 751.0461489735.

The spelling of 423642840 in words is "four hundred twenty-three million, six hundred forty-two thousand, eight hundred forty".