402121242 has 12 divisors (see below), whose sum is σ = 871262730. Its totient is φ = 134040408.

The previous prime is 402121219. The next prime is 402121253. The reversal of 402121242 is 242121204.

402121242 is a `hidden beast` number, since 402 + 1 + 21 + 242 = 666.

It can be written as a sum of positive squares in only one way, i.e., 252523881 + 149597361 = 15891^2 + 12231^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 22340069 = 402121242 / (4 + 0 + 2 + 1 + 2 + 1 + 2 + 4 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11170017 + ... + 11170052.

Almost surely, 2^402121242 is an apocalyptic number.

402121242 is an abundant number, since it is smaller than the sum of its proper divisors (469141488).

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

402121242 is a wasteful number, since it uses less digits than its factorization.

402121242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22340077 (or 22340074 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 402121242 is about 20052.9609285013. The cubic root of 402121242 is about 738.1064578617.

Adding to 402121242 its reverse (242121204), we get a palindrome (644242446).

The spelling of 402121242 in words is "four hundred two million, one hundred twenty-one thousand, two hundred forty-two".