40042161 has 8 divisors (see below), whose sum is σ = 59321760. Its totient is φ = 26694756.

The previous prime is 40042153. The next prime is 40042181. The reversal of 40042161 is 16124004.

It is not a de Polignac number, because 40042161 - 2³ = 40042153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40042141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741495 + ... + 741548.

It is an arithmetic number, because the mean of its divisors is an integer number (7415220).

Almost surely, 2^40042161 is an apocalyptic number.

It is an amenable number.

40042161 is a deficient number, since it is larger than the sum of its proper divisors (19279599).

40042161 is a wasteful number, since it uses less digits than its factorization.

40042161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483052 (or 1483046 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 40042161 is about 6327.8875622122. The cubic root of 40042161 is about 342.1153043036.

Adding to 40042161 its reverse (16124004), we get a palindrome (56166165).

The spelling of 40042161 in words is "forty million, forty-two thousand, one hundred sixty-one".