402243840 has 288 divisors, whose sum is σ = 1454019840. Its totient is φ = 105283584.

The previous prime is 402243839. The next prime is 402243869. The reversal of 402243840 is 48342204.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3559624 + ... + 3559736.

It is an arithmetic number, because the mean of its divisors is an integer number (5048680).

Almost surely, 2^402243840 is an apocalyptic number.

402243840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402243840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727009920).

402243840 is an abundant number, since it is smaller than the sum of its proper divisors (1051776000).

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

402243840 is a wasteful number, since it uses less digits than its factorization.

402243840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 402243840 is about 20056.0175508499. The cubic root of 402243840 is about 738.1814610958.

The spelling of 402243840 in words is "four hundred two million, two hundred forty-three thousand, eight hundred forty".