402242644 has 24 divisors (see below), whose sum is σ = 771036840. Its totient is φ = 182762496.

The previous prime is 402242623. The next prime is 402242647. The reversal of 402242644 is 446242204.

It can be written as a sum of positive squares in 4 ways, for example, as 243734544 + 158508100 = 15612^2 + 12590^2 .

It is a super-2 number, since 2×402242644² = 323598289304221472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402242647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100017 + ... + 103960.

It is an arithmetic number, because the mean of its divisors is an integer number (32126535).

Almost surely, 2^402242644 is an apocalyptic number.

It is an amenable number.

402242644 is a deficient number, since it is larger than the sum of its proper divisors (368794196).

402242644 is a wasteful number, since it uses less digits than its factorization.

402242644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204027 (or 204025 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

The square root of 402242644 is about 20055.9877343401. The cubic root of 402242644 is about 738.1807294783.

Adding to 402242644 its reverse (446242204), we get a palindrome (848484848).

The spelling of 402242644 in words is "four hundred two million, two hundred forty-two thousand, six hundred forty-four".