40012161 has 16 divisors (see below), whose sum is σ = 61221888. Its totient is φ = 22770000.

The previous prime is 40012153. The next prime is 40012163. The reversal of 40012161 is 16121004.

It is not a de Polignac number, because 40012161 - 2³ = 40012153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40012161.

It is not an unprimeable number, because it can be changed into a prime (40012163) 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, 1476 + ... + 9066.

It is an arithmetic number, because the mean of its divisors is an integer number (3826368).

Almost surely, 2^40012161 is an apocalyptic number.

It is an amenable number.

40012161 is a deficient number, since it is larger than the sum of its proper divisors (21209727).

40012161 is a wasteful number, since it uses less digits than its factorization.

40012161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7852.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 40012161 is about 6325.5166587402. The cubic root of 40012161 is about 342.0298441861.

Adding to 40012161 its reverse (16121004), we get a palindrome (56133165).

It can be divided in two parts, 400 and 12161, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 40012161 in words is "forty million, twelve thousand, one hundred sixty-one".