40740221 has 16 divisors (see below), whose sum is σ = 43084800. Its totient is φ = 38486448.

The previous prime is 40740209. The next prime is 40740233. The reversal of 40740221 is 12204704.

It is an interprime number because it is at equal distance from previous prime (40740209) and next prime (40740233).

It is a cyclic number.

It is not a de Polignac number, because 40740221 - 2¹⁰ = 40739197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40740193 and 40740202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40740241) 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, 227510 + ... + 227688.

It is an arithmetic number, because the mean of its divisors is an integer number (2692800).

Almost surely, 2^40740221 is an apocalyptic number.

It is an amenable number.

40740221 is a deficient number, since it is larger than the sum of its proper divisors (2344579).

40740221 is a wasteful number, since it uses less digits than its factorization.

40740221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 40740221 is about 6382.8066710500. The cubic root of 40740221 is about 344.0919085816.

Adding to 40740221 its reverse (12204704), we get a palindrome (52944925).

The spelling of 40740221 in words is "forty million, seven hundred forty thousand, two hundred twenty-one".