40920731 has 4 divisors (see below), whose sum is σ = 40939752. Its totient is φ = 40901712.

The previous prime is 40920727. The next prime is 40920739. The reversal of 40920731 is 13702904.

40920731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40920731 - 2² = 40920727 is a prime.

It is a super-2 number, since 2×40920731² = 3349012451148722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40920731.

It is not an unprimeable number, because it can be changed into a prime (40920739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5801 + ... + 10746.

It is an arithmetic number, because the mean of its divisors is an integer number (10234938).

Almost surely, 2^40920731 is an apocalyptic number.

40920731 is a deficient number, since it is larger than the sum of its proper divisors (19021).

40920731 is a wasteful number, since it uses less digits than its factorization.

40920731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19020.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 40920731 is about 6396.9313737135. The cubic root of 40920731 is about 344.5993556827.

The spelling of 40920731 in words is "forty million, nine hundred twenty thousand, seven hundred thirty-one".