402042224 has 40 divisors (see below), whose sum is σ = 806936448. Its totient is φ = 193847040.

The previous prime is 402042169. The next prime is 402042227. The reversal of 402042224 is 422240204.

It is a junction number, because it is equal to n+sod(n) for n = 402042196 and 402042205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402042227) 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, 155954 + ... + 158510.

Almost surely, 2^402042224 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 402042224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403468224).

402042224 is an abundant number, since it is smaller than the sum of its proper divisors (404894224).

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

402042224 is a wasteful number, since it uses less digits than its factorization.

402042224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2913 (or 2907 counting only the distinct ones).

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

The square root of 402042224 is about 20050.9905989704. The cubic root of 402042224 is about 738.0581080021.

Adding to 402042224 its reverse (422240204), we get a palindrome (824282428).

The spelling of 402042224 in words is "four hundred two million, forty-two thousand, two hundred twenty-four".