423929988 has 18 divisors (see below), whose sum is σ = 1071600894. Its totient is φ = 141309984.

The previous prime is 423929983. The next prime is 423929993. The reversal of 423929988 is 889929324.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (423929983) and next prime (423929993).

It can be written as a sum of positive squares in only one way, i.e., 423042624 + 887364 = 20568^2 + 942^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (423929983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5887881 + ... + 5887952.

It is an arithmetic number, because the mean of its divisors is an integer number (59533383).

Almost surely, 2^423929988 is an apocalyptic number.

It is an amenable number.

423929988 is an abundant number, since it is smaller than the sum of its proper divisors (647670906).

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

423929988 is a wasteful number, since it uses less digits than its factorization.

423929988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11775843 (or 11775838 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 423929988 is about 20589.5601701445. The cubic root of 423929988 is about 751.2157987130.

The spelling of 423929988 in words is "four hundred twenty-three million, nine hundred twenty-nine thousand, nine hundred eighty-eight".