402120442 has 4 divisors (see below), whose sum is σ = 603180666. Its totient is φ = 201060220.

The previous prime is 402120419. The next prime is 402120443. The reversal of 402120442 is 244021204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 402042601 + 77841 = 20051^2 + 279^2 .

It is not an unprimeable number, because it can be changed into a prime (402120443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100530109 + ... + 100530112.

Almost surely, 2^402120442 is an apocalyptic number.

402120442 is a deficient number, since it is larger than the sum of its proper divisors (201060224).

402120442 is a wasteful number, since it uses less digits than its factorization.

402120442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201060223.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 402120442 is about 20052.9409813124. The cubic root of 402120442 is about 738.1059683862.

Adding to 402120442 its reverse (244021204), we get a palindrome (646141646).

The spelling of 402120442 in words is "four hundred two million, one hundred twenty thousand, four hundred forty-two".