40398720 has 128 divisors (see below), whose sum is σ = 131531040. Its totient is φ = 10543104.

The previous prime is 40398719. The next prime is 40398733. The reversal of 40398720 is 2789304.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101562 + ... + 101958.

Almost surely, 2^40398720 is an apocalyptic number.

40398720 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 40398720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65765520).

40398720 is an abundant number, since it is smaller than the sum of its proper divisors (91132320).

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

40398720 is a wasteful number, since it uses less digits than its factorization.

40398720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 460 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 40398720 is about 6355.9987413466. The cubic root of 40398720 is about 343.1277704562.

The spelling of 40398720 in words is "forty million, three hundred ninety-eight thousand, seven hundred twenty".