40540123 has 16 divisors (see below), whose sum is σ = 45390240. Its totient is φ = 35963136.

The previous prime is 40540117. The next prime is 40540127. The reversal of 40540123 is 32104504.

40540123 = 312² + 313² + ... + 533².

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40540123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40540123.

It is not an unprimeable number, because it can be changed into a prime (40540127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42336 + ... + 43282.

It is an arithmetic number, because the mean of its divisors is an integer number (2836890).

Almost surely, 2^40540123 is an apocalyptic number.

40540123 is a deficient number, since it is larger than the sum of its proper divisors (4850117).

40540123 is a wasteful number, since it uses less digits than its factorization.

40540123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 40540123 is about 6367.1126109093. The cubic root of 40540123 is about 343.5276411873.

Adding to 40540123 its reverse (32104504), we get a palindrome (72644627).

The spelling of 40540123 in words is "forty million, five hundred forty thousand, one hundred twenty-three".