40742221 has 4 divisors (see below), whose sum is σ = 43876252. Its totient is φ = 37608192.

The previous prime is 40742209. The next prime is 40742239. The reversal of 40742221 is 12224704.

It is a happy number.

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 1929321 + 38812900 = 1389^2 + 6230^2 .

It is a cyclic number.

It is not a de Polignac number, because 40742221 - 2⁹ = 40741709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40742192 and 40742201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40742281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1566996 + ... + 1567021.

It is an arithmetic number, because the mean of its divisors is an integer number (10969063).

Almost surely, 2^40742221 is an apocalyptic number.

It is an amenable number.

40742221 is a deficient number, since it is larger than the sum of its proper divisors (3134031).

40742221 is a wasteful number, since it uses less digits than its factorization.

40742221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134030.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 40742221 is about 6382.9633400169. The cubic root of 40742221 is about 344.0975391561.

Adding to 40742221 its reverse (12224704), we get a palindrome (52966925).

The spelling of 40742221 in words is "forty million, seven hundred forty-two thousand, two hundred twenty-one".