402400242 has 24 divisors (see below), whose sum is σ = 874467516. Its totient is φ = 133733376.

The previous prime is 402400223. The next prime is 402400267. The reversal of 402400242 is 242004204.

It can be written as a sum of positive squares in 2 ways, for example, as 397643481 + 4756761 = 19941^2 + 2181^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27103 + ... + 39234.

Almost surely, 2^402400242 is an apocalyptic number.

402400242 is an abundant number, since it is smaller than the sum of its proper divisors (472067274).

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

402400242 is a wasteful number, since it uses less digits than its factorization.

402400242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66682 (or 66679 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 402400242 is about 20059.9163009221. The cubic root of 402400242 is about 738.2771228851.

Adding to 402400242 its reverse (242004204), we get a palindrome (644404446).

The spelling of 402400242 in words is "four hundred two million, four hundred thousand, two hundred forty-two".