40385280 has 144 divisors (see below), whose sum is σ = 139073760. Its totient is φ = 9928704.

The previous prime is 40385273. The next prime is 40385291. The reversal of 40385280 is 8258304.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49516 + ... + 50324.

It is an arithmetic number, because the mean of its divisors is an integer number (965790).

Almost surely, 2^40385280 is an apocalyptic number.

40385280 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 40385280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69536880).

40385280 is an abundant number, since it is smaller than the sum of its proper divisors (98688480).

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

40385280 is a wasteful number, since it uses less digits than its factorization.

40385280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846 (or 832 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 40385280 is about 6354.9413844661. The cubic root of 40385280 is about 343.0897152180.

The spelling of 40385280 in words is "forty million, three hundred eighty-five thousand, two hundred eighty".