402421442 has 16 divisors (see below), whose sum is σ = 606981600. Its totient is φ = 200098080.

The previous prime is 402421381. The next prime is 402421457. The reversal of 402421442 is 244124204.

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, 394409 + ... + 395427.

It is an arithmetic number, because the mean of its divisors is an integer number (37936350).

Almost surely, 2^402421442 is an apocalyptic number.

402421442 is a deficient number, since it is larger than the sum of its proper divisors (204560158).

402421442 is a wasteful number, since it uses less digits than its factorization.

402421442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921.

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 402421442 is about 20060.4447109230. Note that the first 3 decimals coincide. The cubic root of 402421442 is about 738.2900877549.

Adding to 402421442 its reverse (244124204), we get a palindrome (646545646).

The spelling of 402421442 in words is "four hundred two million, four hundred twenty-one thousand, four hundred forty-two".