40121761 has 4 divisors (see below), whose sum is σ = 41505300. Its totient is φ = 38738224.

The previous prime is 40121747. The next prime is 40121773. The reversal of 40121761 is 16712104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27625536 + 12496225 = 5256^2 + 3535^2 .

It is a cyclic number.

It is not a de Polignac number, because 40121761 - 2⁷ = 40121633 is a prime.

It is a super-2 number, since 2×40121761² = 3219511411482242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40121261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691726 + ... + 691783.

It is an arithmetic number, because the mean of its divisors is an integer number (10376325).

Almost surely, 2^40121761 is an apocalyptic number.

It is an amenable number.

40121761 is a deficient number, since it is larger than the sum of its proper divisors (1383539).

40121761 is a wasteful number, since it uses less digits than its factorization.

40121761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383538.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 40121761 is about 6334.1740582336. The cubic root of 40121761 is about 342.3418517919.

Adding to 40121761 its reverse (16712104), we get a palindrome (56833865).

It can be divided in two parts, 40 and 121761, that added together give a square (121801 = 349²).

The spelling of 40121761 in words is "forty million, one hundred twenty-one thousand, seven hundred sixty-one".