39947261 has 4 divisors (see below), whose sum is σ = 40007292. Its totient is φ = 39887232.

The previous prime is 39947249. The next prime is 39947287. The reversal of 39947261 is 16274993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16274993 = 7 ⋅2324999.

It can be written as a sum of positive squares in 2 ways, for example, as 16859236 + 23088025 = 4106^2 + 4805^2 .

It is a cyclic number.

It is not a de Polignac number, because 39947261 - 2⁶ = 39947197 is a prime.

It is a super-2 number, since 2×39947261² = 3191567322804242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39947221) 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, 29006 + ... + 30351.

It is an arithmetic number, because the mean of its divisors is an integer number (10001823).

Almost surely, 2^39947261 is an apocalyptic number.

It is an amenable number.

39947261 is a deficient number, since it is larger than the sum of its proper divisors (60031).

39947261 is an equidigital number, since it uses as much as digits as its factorization.

39947261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60030.

The product of its digits is 81648, while the sum is 41.

The square root of 39947261 is about 6320.3845610849. The cubic root of 39947261 is about 341.8448191938.

The spelling of 39947261 in words is "thirty-nine million, nine hundred forty-seven thousand, two hundred sixty-one".