40397856 has 24 divisors (see below), whose sum is σ = 106044624. Its totient is φ = 13465920.

The previous prime is 40397809. The next prime is 40397869. The reversal of 40397856 is 65879304.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210310 + ... + 210501.

It is an arithmetic number, because the mean of its divisors is an integer number (4418526).

Almost surely, 2^40397856 is an apocalyptic number.

It is an amenable number.

40397856 is an abundant number, since it is smaller than the sum of its proper divisors (65646768).

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

40397856 is a wasteful number, since it uses less digits than its factorization.

40397856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420824 (or 420816 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 40397856 is about 6355.9307736948. The cubic root of 40397856 is about 343.1253243019.

The spelling of 40397856 in words is "forty million, three hundred ninety-seven thousand, eight hundred fifty-six".