40720865 has 16 divisors (see below), whose sum is σ = 51891840. Its totient is φ = 30570240.

The previous prime is 40720861. The next prime is 40720903. The reversal of 40720865 is 56802704.

It is not a de Polignac number, because 40720865 - 2² = 40720861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40720861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48116 + ... + 48954.

It is an arithmetic number, because the mean of its divisors is an integer number (3243240).

Almost surely, 2^40720865 is an apocalyptic number.

It is an amenable number.

40720865 is a deficient number, since it is larger than the sum of its proper divisors (11170975).

40720865 is a wasteful number, since it uses less digits than its factorization.

40720865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 40720865 is about 6381.2902300397. The cubic root of 40720865 is about 344.0374063569.

The spelling of 40720865 in words is "forty million, seven hundred twenty thousand, eight hundred sixty-five".