402144420442 has 4 divisors (see below), whose sum is σ = 603216630666. Its totient is φ = 201072210220.

The previous prime is 402144420439. The next prime is 402144420467. The reversal of 402144420442 is 244024441204.

It is a happy number.

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., 374249074081 + 27895346361 = 611759^2 + 167019^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100536105109 + ... + 100536105112.

Almost surely, 2^402144420442 is an apocalyptic number.

402144420442 is a deficient number, since it is larger than the sum of its proper divisors (201072210224).

402144420442 is a wasteful number, since it uses less digits than its factorization.

402144420442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201072210223.

The product of its (nonzero) digits is 32768, while the sum is 31.

Adding to 402144420442 its reverse (244024441204), we get a palindrome (646168861646).

The spelling of 402144420442 in words is "four hundred two billion, one hundred forty-four million, four hundred twenty thousand, four hundred forty-two".