40007923 has 4 divisors (see below), whose sum is σ = 40983768. Its totient is φ = 39032080.

The previous prime is 40007917. The next prime is 40007963. The reversal of 40007923 is 32970004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40007923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40007963) 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, 487861 + ... + 487942.

It is an arithmetic number, because the mean of its divisors is an integer number (10245942).

Almost surely, 2^40007923 is an apocalyptic number.

40007923 is a deficient number, since it is larger than the sum of its proper divisors (975845).

40007923 is an equidigital number, since it uses as much as digits as its factorization.

40007923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975844.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 40007923 is about 6325.1816574704. The cubic root of 40007923 is about 342.0177680770.

Adding to 40007923 its reverse (32970004), we get a palindrome (72977927).

The spelling of 40007923 in words is "forty million, seven thousand, nine hundred twenty-three".