40003123 has 4 divisors (see below), whose sum is σ = 40151008. Its totient is φ = 39855240.

The previous prime is 40003111. The next prime is 40003133. The reversal of 40003123 is 32130004.

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-40003123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40003133) 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, 73536 + ... + 74077.

It is an arithmetic number, because the mean of its divisors is an integer number (10037752).

Almost surely, 2^40003123 is an apocalyptic number.

40003123 is a deficient number, since it is larger than the sum of its proper divisors (147885).

40003123 is a wasteful number, since it uses less digits than its factorization.

40003123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147884.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 40003123 is about 6324.8022103462. The cubic root of 40003123 is about 342.0040895285.

Adding to 40003123 its reverse (32130004), we get a palindrome (72133127).

The spelling of 40003123 in words is "forty million, three thousand, one hundred twenty-three".