402000440 has 32 divisors (see below), whose sum is σ = 943829280. Its totient is φ = 153808512.

The previous prime is 402000439. The next prime is 402000491. The reversal of 402000440 is 44000204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217559 + ... + 219398.

It is an arithmetic number, because the mean of its divisors is an integer number (29494665).

Almost surely, 2^402000440 is an apocalyptic number.

402000440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402000440 is an abundant number, since it is smaller than the sum of its proper divisors (541828840).

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

402000440 is a wasteful number, since it uses less digits than its factorization.

402000440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436991 (or 436987 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 402000440 is about 20049.9486283631. The cubic root of 402000440 is about 738.0325384752.

Adding to 402000440 its reverse (44000204), we get a palindrome (446000644).

The spelling of 402000440 in words is "four hundred two million, four hundred forty", and thus it is an aban number.