40105242 has 24 divisors (see below), whose sum is σ = 87696180. Its totient is φ = 13245120.

The previous prime is 40105229. The next prime is 40105267. The reversal of 40105242 is 24250104.

It can be written as a sum of positive squares in 2 ways, for example, as 36832761 + 3272481 = 6069^2 + 1809^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8259 + ... + 12182.

Almost surely, 2^40105242 is an apocalyptic number.

40105242 is an abundant number, since it is smaller than the sum of its proper divisors (47590938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40105242 is a wasteful number, since it uses less digits than its factorization.

40105242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20558 (or 20555 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40105242 is about 6332.8699655054. The cubic root of 40105242 is about 342.2948621517.

Adding to 40105242 its reverse (24250104), we get a palindrome (64355346).

The spelling of 40105242 in words is "forty million, one hundred five thousand, two hundred forty-two".