402323020 has 96 divisors (see below), whose sum is σ = 986852160. Its totient is φ = 136151040.

The previous prime is 402323017. The next prime is 402323029. The reversal of 402323020 is 20323204.

It is a junction number, because it is equal to n+sod(n) for n = 402322985 and 402323003.

It is not an unprimeable number, because it can be changed into a prime (402323029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 362226 + ... + 363334.

It is an arithmetic number, because the mean of its divisors is an integer number (10279710).

Almost surely, 2^402323020 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 402323020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (493426080).

402323020 is an abundant number, since it is smaller than the sum of its proper divisors (584529140).

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

402323020 is a wasteful number, since it uses less digits than its factorization.

402323020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 402323020 is about 20057.9914248661. The cubic root of 402323020 is about 738.2298938850.

Adding to 402323020 its reverse (20323204), we get a palindrome (422646224).

The spelling of 402323020 in words is "four hundred two million, three hundred twenty-three thousand, twenty".