402011220 has 96 divisors (see below), whose sum is σ = 1226050560. Its totient is φ = 97827840.

The previous prime is 402011161. The next prime is 402011221. The reversal of 402011220 is 22110204.

It is a super-2 number, since 2×402011220² = 323226042011776800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 402011196 and 402011205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402011221) 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, 66525 + ... + 72315.

It is an arithmetic number, because the mean of its divisors is an integer number (12771360).

Almost surely, 2^402011220 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 402011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (613025280).

402011220 is an abundant number, since it is smaller than the sum of its proper divisors (824039340).

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

402011220 is a wasteful number, since it uses less digits than its factorization.

402011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5905 (or 5903 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 402011220 is about 20050.2174551799. The cubic root of 402011220 is about 738.0391354163.

Adding to 402011220 its reverse (22110204), we get a palindrome (424121424).

The spelling of 402011220 in words is "four hundred two million, eleven thousand, two hundred twenty".