402004020 has 96 divisors (see below), whose sum is σ = 1246404096. Its totient is φ = 95990400.

The previous prime is 402004007. The next prime is 402004021. The reversal of 402004020 is 20400204.

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 = 402003987 and 402004005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402004021) 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, 39675 + ... + 48765.

It is an arithmetic number, because the mean of its divisors is an integer number (12983376).

Almost surely, 2^402004020 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 402004020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (623202048).

402004020 is an abundant number, since it is smaller than the sum of its proper divisors (844400076).

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

402004020 is a wasteful number, since it uses less digits than its factorization.

402004020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9181 (or 9179 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 402004020 is about 20050.0379052011. The cubic root of 402004020 is about 738.0347293092.

Adding to 402004020 its reverse (20400204), we get a palindrome (422404224).

The spelling of 402004020 in words is "four hundred two million, four thousand, twenty".