423840920 has 64 divisors (see below), whose sum is σ = 993085920. Its totient is φ = 162653184.

The previous prime is 423840919. The next prime is 423840929. The reversal of 423840920 is 29048324.

It is a super-2 number, since 2×423840920² = 359282250932892800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423840929) 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, 106079 + ... + 110001.

Almost surely, 2^423840920 is an apocalyptic number.

423840920 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 423840920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (496542960).

423840920 is an abundant number, since it is smaller than the sum of its proper divisors (569245000).

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

423840920 is a wasteful number, since it uses less digits than its factorization.

423840920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044 (or 4040 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 423840920 is about 20587.3971157113. The cubic root of 423840920 is about 751.1631846988.

The spelling of 423840920 in words is "four hundred twenty-three million, eight hundred forty thousand, nine hundred twenty".