402242420 has 24 divisors (see below), whose sum is σ = 845111400. Its totient is φ = 160820352.

The previous prime is 402242419. The next prime is 402242437. The reversal of 402242420 is 24242204.

It can be written as a sum of positive squares in 4 ways, for example, as 6948496 + 395293924 = 2636^2 + 19882^2 .

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 = 402242392 and 402242401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58946 + ... + 65414.

It is an arithmetic number, because the mean of its divisors is an integer number (35212975).

Almost surely, 2^402242420 is an apocalyptic number.

It is an amenable number.

402242420 is an abundant number, since it is smaller than the sum of its proper divisors (442868980).

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

402242420 is a wasteful number, since it uses less digits than its factorization.

402242420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9587 (or 9585 counting only the distinct ones).

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

The square root of 402242420 is about 20055.9821499721. The cubic root of 402242420 is about 738.1805924528.

Adding to 402242420 its reverse (24242204), we get a palindrome (426484624).

The spelling of 402242420 in words is "four hundred two million, two hundred forty-two thousand, four hundred twenty".