402242646 has 48 divisors (see below), whose sum is σ = 876546576. Its totient is φ = 122997888.

The previous prime is 402242623. The next prime is 402242647. The reversal of 402242646 is 646242204.

It is a super-2 number, since 2×402242646² = 323598292522162632, which contains 22 as substring.

It is a Curzon number.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174276 + ... + 176568.

It is an arithmetic number, because the mean of its divisors is an integer number (18261387).

Almost surely, 2^402242646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402242646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (438273288).

402242646 is an abundant number, since it is smaller than the sum of its proper divisors (474303930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402242646 is a wasteful number, since it uses less digits than its factorization.

402242646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497 (or 2484 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 402242646 is about 20055.9877842005. The cubic root of 402242646 is about 738.1807307017.

The spelling of 402242646 in words is "four hundred two million, two hundred forty-two thousand, six hundred forty-six".