40720831 has 16 divisors (see below), whose sum is σ = 45390240. Its totient is φ = 36357120.

The previous prime is 40720829. The next prime is 40720859. The reversal of 40720831 is 13802704.

It is a cyclic number.

It is not a de Polignac number, because 40720831 - 2¹ = 40720829 is a prime.

It is a super-2 number, since 2×40720831² = 3316372154661122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40720796 and 40720805.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25000 + ... + 26578.

It is an arithmetic number, because the mean of its divisors is an integer number (2836890).

Almost surely, 2^40720831 is an apocalyptic number.

40720831 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

40720831 is a deficient number, since it is larger than the sum of its proper divisors (4669409).

40720831 is a wasteful number, since it uses less digits than its factorization.

40720831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 40720831 is about 6381.2875660011. The cubic root of 40720831 is about 344.0373106052.

The spelling of 40720831 in words is "forty million, seven hundred twenty thousand, eight hundred thirty-one".