423171840 has 432 divisors, whose sum is σ = 1702880928. Its totient is φ = 88768512.

The previous prime is 423171817. The next prime is 423171841. The reversal of 423171840 is 48171324.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 423171798 and 423171807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423171841) 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 47 ways as a sum of consecutive naturals, for example, 2445994 + ... + 2446166.

It is an arithmetic number, because the mean of its divisors is an integer number (3941854).

Almost surely, 2^423171840 is an apocalyptic number.

423171840 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 423171840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851440464).

423171840 is an abundant number, since it is smaller than the sum of its proper divisors (1279709088).

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

423171840 is a wasteful number, since it uses less digits than its factorization.

423171840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 423171840 is about 20571.1409503703. The cubic root of 423171840 is about 750.7677116680.

The spelling of 423171840 in words is "four hundred twenty-three million, one hundred seventy-one thousand, eight hundred forty".