40723591 has 4 divisors (see below), whose sum is σ = 40906432. Its totient is φ = 40540752.

The previous prime is 40723583. The next prime is 40723597. The reversal of 40723591 is 19532704.

40723591 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 40723591 - 2³ = 40723583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40723597) 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, 91086 + ... + 91531.

It is an arithmetic number, because the mean of its divisors is an integer number (10226608).

Almost surely, 2^40723591 is an apocalyptic number.

40723591 is a deficient number, since it is larger than the sum of its proper divisors (182841).

40723591 is a wasteful number, since it uses less digits than its factorization.

40723591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182840.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 40723591 is about 6381.5038196337. The cubic root of 40723591 is about 344.0450832161.

It can be divided in two parts, 40723 and 591, that added together give a palindrome (41314).

The spelling of 40723591 in words is "forty million, seven hundred twenty-three thousand, five hundred ninety-one".