40008723 has 4 divisors (see below), whose sum is σ = 53344968. Its totient is φ = 26672480.

The previous prime is 40008697. The next prime is 40008733. The reversal of 40008723 is 32780004.

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 40008723 - 2¹⁴ = 39992339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40008693 and 40008702.

It is not an unprimeable number, because it can be changed into a prime (40008733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6668118 + ... + 6668123.

It is an arithmetic number, because the mean of its divisors is an integer number (13336242).

Almost surely, 2^40008723 is an apocalyptic number.

40008723 is a deficient number, since it is larger than the sum of its proper divisors (13336245).

40008723 is a wasteful number, since it uses less digits than its factorization.

40008723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13336244.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 40008723 is about 6325.2448964447. The cubic root of 40008723 is about 342.0200477287.

Adding to 40008723 its reverse (32780004), we get a palindrome (72788727).

The spelling of 40008723 in words is "forty million, eight thousand, seven hundred twenty-three".