402144331 has 4 divisors (see below), whose sum is σ = 402262192. Its totient is φ = 402026472.

The previous prime is 402144319. The next prime is 402144341. The reversal of 402144331 is 133441204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402144331 - 2¹¹ = 402142283 is a prime.

It is a super-2 number, since 2×402144331² = 323440125910875122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402144341) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 53655 + ... + 60688.

It is an arithmetic number, because the mean of its divisors is an integer number (100565548).

Almost surely, 2^402144331 is an apocalyptic number.

402144331 is a deficient number, since it is larger than the sum of its proper divisors (117861).

402144331 is a wasteful number, since it uses less digits than its factorization.

402144331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117860.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 402144331 is about 20053.5366207560. The cubic root of 402144331 is about 738.1205844584.

Adding to 402144331 its reverse (133441204), we get a palindrome (535585535).

The spelling of 402144331 in words is "four hundred two million, one hundred forty-four thousand, three hundred thirty-one".