402442323220 has 96 divisors (see below), whose sum is σ = 989935914240. Its totient is φ = 134544552960.

The previous prime is 402442323209. The next prime is 402442323221. The reversal of 402442323220 is 22323244204.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402442323221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11617686 + ... + 11652274.

It is an arithmetic number, because the mean of its divisors is an integer number (10311832440).

Almost surely, 2^402442323220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402442323220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (494967957120).

402442323220 is an abundant number, since it is smaller than the sum of its proper divisors (587493591020).

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

402442323220 is a wasteful number, since it uses less digits than its factorization.

402442323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36673 (or 36671 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 402442323220 its reverse (22323244204), we get a palindrome (424765567424).

The spelling of 402442323220 in words is "four hundred two billion, four hundred forty-two million, three hundred twenty-three thousand, two hundred twenty".