402442220 has 24 divisors (see below), whose sum is σ = 848191344. Its totient is φ = 160393536.

The previous prime is 402442219. The next prime is 402442223. The reversal of 402442220 is 22244204.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 402442192 and 402442201.

It is not an unprimeable number, because it can be changed into a prime (402442223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30782 + ... + 41861.

It is an arithmetic number, because the mean of its divisors is an integer number (35341306).

Almost surely, 2^402442220 is an apocalyptic number.

It is an amenable number.

402442220 is an abundant number, since it is smaller than the sum of its proper divisors (445749124).

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

402442220 is a wasteful number, since it uses less digits than its factorization.

402442220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72929 (or 72927 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 402442220 is about 20060.9625890684. The cubic root of 402442220 is about 738.3027941085.

Adding to 402442220 its reverse (22244204), we get a palindrome (424686424).

The spelling of 402442220 in words is "four hundred two million, four hundred forty-two thousand, two hundred twenty".