423899784 has 288 divisors, whose sum is σ = 1510135200. Its totient is φ = 109771200.

The previous prime is 423899771. The next prime is 423899789. The reversal of 423899784 is 487998324.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 423899784.

It is not an unprimeable number, because it can be changed into a prime (423899789) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1280499 + ... + 1280829.

It is an arithmetic number, because the mean of its divisors is an integer number (5243525).

Almost surely, 2^423899784 is an apocalyptic number.

423899784 is a gapful number since it is divisible by the number (44) 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 423899784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (755067600).

423899784 is an abundant number, since it is smaller than the sum of its proper divisors (1086235416).

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

423899784 is a wasteful number, since it uses less digits than its factorization.

423899784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 354 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 423899784 is about 20588.8266785652. The cubic root of 423899784 is about 751.1979575116.

The spelling of 423899784 in words is "four hundred twenty-three million, eight hundred ninety-nine thousand, seven hundred eighty-four".