40004123 has 4 divisors (see below), whose sum is σ = 40193928. Its totient is φ = 39814320.

The previous prime is 40004119. The next prime is 40004131. The reversal of 40004123 is 32140004.

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 40004123 - 2² = 40004119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40004098 and 40004107.

It is not an unprimeable number, because it can be changed into a prime (40004143) 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, 94586 + ... + 95007.

It is an arithmetic number, because the mean of its divisors is an integer number (10048482).

Almost surely, 2^40004123 is an apocalyptic number.

40004123 is a deficient number, since it is larger than the sum of its proper divisors (189805).

40004123 is a wasteful number, since it uses less digits than its factorization.

40004123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189804.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 40004123 is about 6324.8812637076. The cubic root of 40004123 is about 342.0069393164.

Adding to 40004123 its reverse (32140004), we get a palindrome (72144127).

The spelling of 40004123 in words is "forty million, four thousand, one hundred twenty-three".