402444020402 has 4 divisors (see below), whose sum is σ = 603666030606. Its totient is φ = 201222010200.

The previous prime is 402444020353. The next prime is 402444020417. The reversal of 402444020402 is 204020444204.

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., 227024613841 + 175419406561 = 476471^2 + 418831^2 .

It is a super-2 number, since 2×402444020402² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100611005099 + ... + 100611005102.

Almost surely, 2^402444020402 is an apocalyptic number.

402444020402 is a deficient number, since it is larger than the sum of its proper divisors (201222010204).

402444020402 is a wasteful number, since it uses less digits than its factorization.

402444020402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201222010203.

The product of its (nonzero) digits is 8192, while the sum is 26.

Adding to 402444020402 its reverse (204020444204), we get a palindrome (606464464606).

The spelling of 402444020402 in words is "four hundred two billion, four hundred forty-four million, twenty thousand, four hundred two".