402236644 has 24 divisors (see below), whose sum is σ = 715907808. Its totient is φ = 197704320.

The previous prime is 402236633. The next prime is 402236683. The reversal of 402236644 is 446632204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157659 + ... + 160189.

It is an arithmetic number, because the mean of its divisors is an integer number (29829492).

Almost surely, 2^402236644 is an apocalyptic number.

It is an amenable number.

402236644 is a deficient number, since it is larger than the sum of its proper divisors (313671164).

402236644 is a wasteful number, since it uses less digits than its factorization.

402236644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195 (or 3193 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 402236644 is about 20055.8381525181. The cubic root of 402236644 is about 738.1770591345.

Adding to 402236644 its reverse (446632204), we get a palindrome (848868848).

The spelling of 402236644 in words is "four hundred two million, two hundred thirty-six thousand, six hundred forty-four".